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Vol. 97 No. 2 June 1968
National Science Development Board
Juan S. Salcedo, Jr., M.S., M.D.,ChairmanDiminador O. Reyes.,Ll. B.,
Officer-in-Charge, Office of Vice Chairman and Executive Director
Members of the Board
Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research CenterVacant
Biological Research CenterLuz Baens-Arcega, M.S.
Director
Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.
Director
Industrial Research CenterFelife Ll. Santillan, B.S.M.E.
Director
Medical Research CenterRogelio N. Relova, M.D.
Director
Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., EditorClare Baltazar, Ph.D.; Ireana R.F. Cruz, A.M.; Guillermina Mañalac, M.S., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Faustino S. Orillo, Ph.D.Antonio Pizarro, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.F.Landa Jocano, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Jose Vera Santos, Ph.D.Gregorio Velasquez, Ph.D.ChemistryAlfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.
NutritionLeon G. Alejo, B.S.Josefina B. Jayme, M.D.Sonia Y. De Leon, Ph.D.Luz U. Oñate, Ph.D.
GeologyArturo Alcaraz, M.S.Cecar B. Ibañez, M.S.Mateo H. Tupaz, Ph.D.Elpidio C. Vera, M.S.
MedicinePaulo C. Campos, M.D.Conrado S. Dayrit, M.D.Rogelio N. Relova, M.D.Victor Valenzuela, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Macario Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Ramon Samaniego, Ph.D.Getulio B. Viado, Ph.D.
ZoologyNelia P. Salazar, M.S.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.
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Vol. 97 No. 1 March, 1968National Science Development Board
Juan S. Salcedo, Jr., M.S., M.D.,ChairmanDiminador O. Reyes.,Ll. B.,
Officer-in-Charge, Office of Vice Chairman and Executive Director
Members of the Board
Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research CenterVacant
Biological Research CenterLuz Baens-Arcega, M.S.
Director
Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.
Director
Industrial Research CenterFelife Ll. Santillan, B.S.M.E.
Director
Medical Research CenterRogelio N. Relova, M.D.
Director
Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., EditorClare Baltazar, Ph.D.; Ireana R.F. Cruz, A.M.; Guillermina Mañalac, M.S., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Faustino S. Orillo, Ph.D.Antonio Pizarro, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.F.Landa Jocano, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Jose Vera Santos, Ph.D.Gregorio Velasquez, Ph.D.ChemistryAlfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.
NutritionLeon G. Alejo, B.S.Josefina B. Jayme, M.D.Sonia Y. De Leon, Ph.D.Luz U. Oñate, Ph.D.
GeologyArturo Alcaraz, M.S.Cecar B. Ibañez, M.S.Mateo H. Tupaz, Ph.D.Elpidio C. Vera, M.S.
MedicinePaulo C. Campos, M.D.Conrado S. Dayrit, M.D.Rogelio N. Relova, M.D.Victor Valenzuela, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Macario Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Ramon Samaniego, Ph.D.Getulio B. Viado, Ph.D.
ZoologyNelia P. Salazar, M.S.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.
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Vol. 96 No. 4 December, 1967National Science Development Board
Juan S. Salcedo, Jr., M.S., M.D.,ChairmanDiminador O. Reyes.,Ll. B., Officer-in-Charge, Office Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research CenterVacant
Biological Research CenterLuz Baens-Arcega, M.S.
Director
Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.
Director
Industrial Research CenterFelife Ll. Santillan, B.S.M.E.
Director
Medical Research CenterRogelio N. Relova, M.D.
Director
Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., EditorIreana R.F. Cruz, A.M., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition
Sonia Y. De Leon, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.
ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.
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Vol. 96 No. 3 September, 1967National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanDiminador O. Reyes., Officer-in-Charge, Office Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research CenterVacant
Biological Research CenterLuz Baens-Arcega, M.S.
Director
Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.
Director
Industrial Research CenterFelife Ll. Santillan, B.S.M.E.
Director
Medical Research CenterRogelio N. Relova, M.D.
Director
Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., EditorIreana R.F. Cruz, A.M., Associate EditorMauro Garcia, B.S.E., Managing Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition
Sonia Y. De Leon, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.
ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.
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Vol. 96 No. 2 June, 1967National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanDiminador O. Reyes., Officer-in-Charge, Office Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research CenterVacant
Biological Research CenterLuz Baens-Arcega, M.S.
Director
Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.
Director
Industrial Research CenterFelife Ll. Santillan, B.S.M.E.
Director
Medical Research CenterRogelio N. Relova, M.D.
Director
Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., EditorIleana R.F. Cruz, A.M., Associate EditorMauro Garcia, B.S.E., Managing Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition
Sonia Y. De Leon, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.
ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 96 No. 1 March, 1967National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanDiminador O. Reyes., Officer-in-Charge, Office Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research CenterVacant
Biological Research CenterLuz Baens-Arcega, M.S.
Director
Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.
Director
Industrial Research CenterFelife Ll. Santillan, B.S.M.E.
Director
Medical Research CenterRogelio N. Relova, M.D.
Director
Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, EditorIleana R. F. Cruz, A.M., Associate EditorMauro Garcia, B.S.E., Managing Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition
Sonia Y. De Leon, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.
ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.
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Vol. 95 No. 4 December,1966
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 95 No. 3 September,1966
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 95 No. 2 June,1966
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 94 No. 4 December,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 94 No. 3 September,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 94 No. 2 June,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 94 No. 1 March,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 93 No. 4 December,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 93 No. 3 September,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 93 No. 2 June,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 93 No. 1 March,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.
GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.
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Vol. 92 No. 4 December,1963
National Science Development Board
Juan S. Salcedo, Jr., M.D., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.
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Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D
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Vol. 92 No. 3 September,1963
National Science Development Board
Juan S. Salcedo, Jr., M.D., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Conrado R. Pascual, M.D.
GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D
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.
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Vol. 92 No. 2 June ,1963
National Science Development Board
Juan S. Salcedo, Jr., M.D., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.
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Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.
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Vol. 92 No. 1 March ,1963
National Science Development Board
Paulino J. Garcia, M.D., ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.
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Agustin F. Umali, B.S. Getulio B. Vialdo, Ph.D.
Vol. 91 No. 4 December ,1962
National Science Development Board
Paulino J. Garcia, M.D., ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Jose J. Mirasol, Ph.D. Jose P. Marcelo, M.S. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editors
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.
Carmen Ll. Intengan, Ph.D.Sonia Y. De Leon, Ph.D.Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
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ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.
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Vol. 91 No. 3 September ,1962
National Science Development Board
Juan S. Salcedo, Jr., M.D., M.S., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Jose J. Mirasol, Ph.D. Jose P. Marcelo, M.S. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, B.A., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editors
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Carmen Ll. Intengan, Ph.D.Leonarda M. Jurado, Ph.D.
Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.
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Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.
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Vol. 91 No. 1-2 March-June ,1962
National Science Development Board
Juan S. Salcedo, Jr., M.D., M.S., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Jose J. Mirasol, Ph.D. Jose P. Marcelo, M.S. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, B.A., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editors
AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.
AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.
BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.
ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.
Food and NutritionBernardo Acena, Ph.D.Carmen Ll. Intengan, Ph.D.Leonarda M. Jurado, Ph.D.
Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.
MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.
MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.
Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.
ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.
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Agustin F. Umali, B.S. Getulio B. Vialdo, Ph.D.Vol. 90 No. 4 December,1961
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Canuto G. Manuel, D.Sc. Juan S. Salsedo, Jr., M.D., M.A. Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D.Florencio A. Medina, M.S. Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.Editor
Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
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Vol. 90 No. 3 September,1961
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Juan S. Salsedo, Jr., M.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc. Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.Editor
Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
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Vol. 90 No. 2 June,1961
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Juan S. Salsedo, Jr., M.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc. Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.Editor
Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
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Vol. 90 No. 1 March,1961
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Juan S. Salsedo, Jr., M.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc. Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.Editor
Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.
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Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 89 No. 3 September-December,1960
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.
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Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 89 No. 2 June,1960
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial Technology
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Dionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 89 No. 1 March,1960
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
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Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 4 December,1959
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
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Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 3 September,1959
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.
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Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 2 June,1959
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.
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Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Feliza, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 1 March, 1959
National Science Development Board
Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.Editor
Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor
Mauro Garcia, B.S.E.Copy Editor
Contributing Editors
Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.
Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.
Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.
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Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.
Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.