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July 5, 94 SCEE-DRTISEMENS2 A Skin 4/1,000,000" Thick Surfacing a lens with Balcote* requires a coating that is optically one- quarter of one wavelength of light thick . . . only four millionths of an inch! Special equipment, in a matter of minutes, deposits a skin on the glass with exact control of thickness, producing the Balcoted surface. The accomplishment of this operation on a production basis represents the evolution of methods and materials on which Bausch & Lomb scientists have worked for many years. Bausch & Lomb Optical Co., 642-7 St. Paul Street, Rochester 2, New York. *Balcote Transmission Film is the revolutionary Bausch & Lomb lens surface treatment which reduces reflection and flare, and permits the passage of more light. BAUSCH & LOMB ESTA BLI S HED 1 8 53 21 SCIENCE-ADVERTISEMENTS July 5, 1946

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Page 1: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

July 5, 94 SCEE-DRTISEMENS2

A Skin 4/1,000,000" ThickSurfacing a lens with Balcote* requires a coating that is optically one-quarter of one wavelength of light thick . . . only four millionths ofan inch!

Special equipment, in a matter of minutes, deposits a skin on the glasswith exact control of thickness, producing the Balcoted surface. Theaccomplishment of this operation on a production basis represents theevolution of methods and materials on which Bausch & Lomb scientistshave worked for many years. Bausch & Lomb Optical Co., 642-7 St.Paul Street, Rochester 2, New York.*Balcote Transmission Film is the revolutionary Bausch & Lomb lens surface treatment which

reduces reflection and flare, and permits the passage of more light.

BAUSCH & LOMBESTABLI SHED 1 8 53

21SCIENCE-ADVERTISEMENTSJuly 5, 1946

Page 2: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

SCIENCE-ADVERTISEMENTS

2

LA B G

I9"

FIBERGLAS Ii'to defc

A technique*, utilizing Fiberglascloth, has been developed byJulius J. Gottlieb, D.S.C., andMorris M. Gottlieb, D.S.C., formolding plastics laminates intoprosthetic appliances t.

Negative and positive casts ofthe foot are made by the usualmethods. A predetermined num-ber of cut-to-shape plies ofFiberglas fabric, pre-impregnatedwith low-pressure resin, are ap-plied to the cast. The positivecast with the applied laminateis inserted and sealed in an air-tight bag. The air is exhaustedfrom the bag and a vacuum ismaintained during the heat-curing period.The result is a strong, light-

weight appliance that fits. It is

unaffected by body acids, doesnot absorb perspiration, will notoxidize and is dimensionallystable.

This is but one of many usesof Fiberglas in medicine. Manyphysical properties not oftenfound in combination are re-sponsible for the contributionsFiberglas has been able to makein fields of research bearing onhealth. Fiberglas is glass in fiberform. It is an inorganic, nontoxic,nonallergenic, nonsensitizing andchemically stable material thatproduces no harmful effect uponhuman tissue.We shall be glad to refer your

request for information aboutFiberglas-plastics foot prostheticappliances to the Drs. Gottlieb.

Or, a complete bibliography ofthe data compiled on the subjectof Fiberglas materials and theirmedical aspects will be for-warded on request. Write: Owens-Corning Fiberglas Corporation,Dept. 2033, Toledo 1, Ohio.Branches in principal cities.

In Canada: Fiberglas Canada Ltd.,Oshawa, Ont.

* * *

*Reprints of the paper on this subjectwhich appeared in The Journal of theNational Association of Chiropodists,Jan. '46, will be furnished on request.tTypical examples: A. Whitman rockerappliance; B. Modified Whitman withheel cup; C. Modified Whitman withmetatarsal raise; D. Modified Whitmanwith heel cup and metatarsal raise; E.Simple foot plate; F. Combinationmetatarsal and longitudinal arch appli-ance; G. Metatarsal appliance.

%M

22 Vol. 104, No. 2688

Page 3: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

JSCIENCE-ADVERTISEMENTS 23

More than Iron and SteelIron - steel - bronze - copper - aluminum - magnesium - allare used in the manufacture of International Centrifuges. Butmore important than any of these is the skill and repulation of themaker, acquired through more than forty years of experience inCentrifuge production. These are your guarantee that eachInternational Centrifuge is a product of finest quality.

CY~afers of cghne 6.entrjfuges for C(lore ikan cgorly (BearsINTERNATIONAL EQUIPMENT COMPANY

BOSTON, MASSACHUSETTS

July 5, 1946

Page 4: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

SCIENCE-ADVERTISEMENTS

electrical pipe-line

Microwaves make their journey from appa-ratus to antenna not by wire, cable, or coaxial-but by waveguide.

Long before the war, Bell Laboratories bytheory and experiment hod proved that ametal tube could serve as a pipe-line for thetransmission of electric waves, even over greatdistances.War came, and with it the sudden need

for a conveyor of the powerful microwavepulses of radar. The metal waveguide wasthe answer. Simple, rugged, containing noinsulation, it would operate unchanged inheat or cold. In the radar shown above, whichkept track of enemy and friendly planes, awaveguide conveyed microwave pulses be-

EXPLORING AND INVENTING, DEVISING AND

PERFECTING FOR CONTINUED IMPROVEMENTS

tween reflector and the radar apparatus inthe pedestal. Bell Laboratories' engineersfreely shared their waveguide discoveries withwar industry.Now, by the use of special shapes and

strategic angles, by putting rods across theinside and varying the diameter, waveguidescan be made to separate waves of differentlengths. They can slow up waves, hurry themalong, reflect them, or send them into spaceand funnel them back. Bell Laboratories arenow developing waveguides to conduct micro-wave energy in new radio relay systems,capable of carrying hundreds of telephoneconversations simultaneously with televisionand music programs.

qm'{.Ei1juUEIuIj1!f.L¶u5hg1iJIfijiJ1(

AND ECONOMIES IN TELEPHONE SERVICE

24 Vol. 104, No. 2688

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Page 5: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

July 5, 1946 SCIENCE-ADVERTISEMENTS

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Page 6: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

SCIENCE-ADVERTISEMENTS Vol. 104, No. 2688

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Page 7: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

SCIENCE-ADVERTISEMENTS

Klett made * * 0

Glass Absorption Cells

THE LaMOTTEROULETTE COMPARATOR

A permanent laboratory installation for making pHdeterminations over an extended pH range underuniform lighting conditions. Equipped with anilluminated dalite field it is highly recommendedfor research and central laboratory control work.Range-any three sets of LaMotte pH standards inintervals of 0.2 pH. Accurate to 0.1 pH. Pricecomplete, $75.00 f.o.b. Towson, Md.

If you do not have the LaMotte ABC of pH Con-trol, a complimentary copy will be sent upon requestwithout obligation.

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RECENT PUBLICATIONSCARNE61E INSTITUTION OF WASHINOTON

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i557 Contributions to Embryology, Vol. DELHI,Nos. 198 to 206. Quarto, xl+ 175 pages, 45plates, 28 figures. (1945.) Paper, $4.50; cloth,$5.00.

563 McKee, Edwin D., and Charles E. Resser.Cambrian History of the Grand CanyonRegion. Part I. Stratigraphy and Ecologyof the Grand Canyon Cambrian. Part II.Cambrian Fossils of the Grand Canyon. 4Octavo, viii+232 pages, 27 plates, 12 figures.(1945.) Paper, $2.50; cloth, $3.00.

564 Clausen, F. D., D. Keck, and W. N. Hiesey.Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy with Examples fromthe Madinae. Octavo, vii+174 pages, 86 fig-ures. (1945.) Paper, $1.25; cloth, $2.00.

Year Book 44. July 1, 1944-June 30, 1945. Reports 4on current research from all the Departmentsof the Institution. Paper, $1.00; cloth, $1.50. 4

The Carnegie Institution of Washington, Wash-ington 5, D. C., has published some 850 volumescovering the wide range of its researches. Ordersmay be placed direct or through regular dealers.Advise subjects in which you are interested, andcatalogue will be sent upon request.

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Page 8: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

Personnel PlacementCOUNCIL OF SCIENTIFIC

AND INDUSTRIALRESEARCH

Delhi, IndiaDirector, National Metallurgical LaboratoryThe Council of Scientific and Inidustrial Research

invite applications for the post of Director, NationalMetallurgical Laboratory to be established at Jam-shedpur. The work in the proposed laboratory willmainly comprise of fundamental and applied researchon ferrous and non-ferrous metals and minerals witha view to develop and expand the primary and secon-dary metallurgical industries of the country. Candi-dates must possess: (1) Very high academic qualifica-tions; (2) Outstanding published research work onmetallurgy; and physics or physical-chemistry as ap-plied to metallurgy; and (3) Practical experience ofmodern metallurgical processes. Preference will begiven to those who have had at least 10 years admin-istrative experience in an institution of repute or witha large industrial concern. Age not less than 45 years.The starting salary is 2,000 rupees per month with anannual increase of 100 rupees per month until themaximum salary of 2,500 rupees per month is reached(1 rupee=30.5 cents). The Council can consider thegrant of a higher salary to an exceptionally qualifiedcandidate. The appointment will be for 5 years ona contractual basis. The incumbent selected will beeligible to the benefits of the Council's ContributoryProvident Fund; the rate of his subscription being614 percent, the Council contributing an equal amount.The selected candidate will not be required to joinbefore April 1947 but If appointed he will be expectedto advise on the proposed plans for the Laboratory.Canvassing in any form will be considered a disquali-fication. Two copies of the application, together withcopies of testimonials and published papers should besent so as to reach the Secretary, Council of Scientificand Industrial Research, The Mall, Delhi, not laterthan the 15th August 1940.

COUNCIL OF SCIENTIFICAND INDUSTRIAL

RESEARCHDelhi, India

Director, National Chemical Laboratory

The Council of Scientific and Industrial Research in-vite applications for the post of Director, NationalChemical Laboratory to be established at Poona(India). Candidates must possess very high academicqualifications and should be first class research- work-ers in any branch of Chemistry. They must haveinternationally recognized published work on funda-mental or Industrial research to their credit. Prefer-ence will be given to a person with at least 10 yearsadministrative experience In an institution of repute.Age not less than 45 years. The starting salary is2,000 rupees per month with an annual increase of 100rupees per month until the maximum salary of 2,500rupees per month is reached (1 rupee = 30.5 cents).The Council can consider the grant of a higher salaryto an exceptionally qualified candidate. The appoint-ment will be on a contractual basis of 5 years. Theincumbent selected will be eligible to the benefits ofthe Council's Contributory Provident Fund; the rateof his subscription being 6V4 percent, the Councilcontributing an equal amount. The selected candi-date will not be required to join before April 1947but if appointed he will be expected to advise on theproposed plans for the Laboratory. Canvassing inany form will be considered a disqualification. Twocopies of the application, together with copies oftestimonials and published papers should be sent soas to reach the Secretary, Council of Scientific andIndustrial Research, The Mall, Delhi, not later thanthe 15th August 1946.

I

NEWFOUNDLAND GOVERNMENT LABORATORYApplications are invited for the following fisheries research posts in the NewfoundlandGovernment Laboratory:(1) Senior Chemist-Candidates should possess Doctor's degree in Chemistry and havehad experience in research on fisheries products. Salary $5,000 rising by annual in-crements of $200 to $6,000, or $4,000 rising by annual increments of $100 to $5,000 accord-ing to experience and ability.(2) Chemist-Candidates should possess good qualifications in Chemistry with postgraduate experience. Salary $3,000 rising by annual increments of $100 to $4,000.(3) Marine Biologist-The post involves research on one or more of the ground fishesand also some hydrography. Candidates should be able when necessary to carry out bio-logical and hydrographical work at sea. Salary $3,000 rising by annual increments of$100 to $4,000.All posts are non-contributary pensionable posts in the Newfoundland Civil Service.Further particulars can be obtained on request. Applications, stating age, qualifications,experience and the names of two or three references should be sent to:

The DirectorNewfoundland Government Laboratory

St. John's, Newfoundland

.1

Page 9: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

Personnel PlacemntPOSITIONS WANTED

Botanist, Ph.D. Seventeen years college and university ex-perience, now department head. Research and publications,mostly taxonomic. Prefer Southwest. Box 533, SCIENCE.

The California Medical Bureau, Agency for scientific and alypersonnel In medicine, biology, chemistry, physics, and alliedsciences, supplies teachers, research workers, laboratorydieners, skilled office help. Prompt service. Registrationfree. Your patronage respectfully solicited. THE CALI-FORNIA MEDICAL BUREAU, Agency, Arcade Medical Center, 696Colorado Street, Pasadena 1, California.

Opportunities wanted-Zoologist; A.M. (major Biology),Ph.D. (major, Zoology); training has been in colleges anduniversity stressing liberal arts; experience mainly in pro-fessional training in sciences; past six years, professor ofbiology young women's college; for further information,please write BURNEICE LARSON, Director, Medical Bureau,Palmolive Building, Chicago 11.

Physicians, Laboratory and X-Ray Technicians, Bacteriolo-gists, Pharmacists, Physical Therapists let us help yousecure a position. Our service, established 1896, Is Nation-wide. Write us today. All information confidential.AZNOE'S-WOODWARD BUREAU, 30 North Michigan, Chicago 2.

Physiologist, Ph.D., 1941; teaching experience in mammalianphysiology; research experience in visual, neuro, and cardio-vascular physiology. Publications. Desires teaching orresearch opportunity. Box 532, SCIENCE.

POSITIONS OPEN

Biochemist with background of poultry nutrition for north-ern New England manufacturer of feed ingredients. Op-portunity for adaptable man to take charge of a control andresearch laboratory. Also practical plant work in additionto laboratory work. Young man preferred. State age,training, experience and salary desired. Box 531, SCIENCE.

Botanist. Instructorship general botany and course indendrology. Address B. W. WELLS, State College, Raleigh,North Carolina.

Biochemist with experience in Warburg technique for prob-lem in tissue metabolism. Apply W. M. AsHBY, BlackburnLaboratory, St. Elizabeths Hospital, Washington 20, D. C.

Entomologist-parasitologist for malaria project. Full-timeresearch position. Salary $3,000-$3,600. Central States loca-tion. Box 534, SCIENCE.

Director of Pharmaceutical ResearchLarge midwestern pharmaceutical firm needs a Ph.D.or the equivalent to direct formulation of new phar-maceutical products. Very responsible position per-taining to the development of new pharmaceuticaldosage forms. Men with experience in manufactureof ampuls, tablets, liquids, ointments and relatedproducts will be given preference. Practical experi-ence is essential for this position. Box 528, SCIENCE.

Personnel PlacenwntPOSITIONS OPEN

Pharmacologist, Ph.D. or equivalent with background inanalytical and biological chemistry. Research on pharma-ceutical products; university medical school; man or woman;permanent. Please apply only if available for interview inNew York; give salary expected and references in first letter.Box 536, SCIENCE.

Pharmacologist. Permanent research research position withwell known pharmaceutical firm in attractive upstate NewYork community. M.D. or Ph.D. of proven research abilityneeded. Salary commensurate with qualifications. Submitdetails of education, experience and salary desired. Box535, SCIENCE.

Opportunities available-(a) Physicist well trained in chem-istry; duties consist of research in all the classical physics;strictly research with very little development or routinework; large industrial company; f5,500-$7,500. (b) Bac-teriologist; Ph.D. in bacteriology with substantial chemicalbackground for research and development in field of strepto-coccus antigens; large pharmaceutical company; East. (c)Young physician trained in pathology, anatomy or bacteriol-ogy for special investigative work and teaching in the re-lated phases of orthopedic surgery; full-time; universitymedical center; $4,000 plus an additional $1,000 for equip-ment and supplies for research. (d) Physiologist with in-terest in biophysics or physics for position of scientificconsultant with large organization; duties include research,preparing and editing scientific reports; work would involveattending at least two medical conventions annually; $4,000.(e) Two biochemists of Ph.D. level; one should be qualifiedin bacteriology; department of research, large company;East. (f) Young physician interested in becoming associatedin pharmaceutical industry; duties consist of research de-velopment of technical literature and serving as counseloron pharmaceutical medicaments; East. (g) Pharmaceuticalchemist with executive experience; one of the leading com-panies in the industry; salary depending upon qualificationsbut minimum, $6,000-$7,000. S6-3 Medical Bureau (BURNEICELARSON. Director). Palmolive Building, ChIego 11.

The Market PlaceBOOKS

Wanted to purchase: Scientific Periodicals, sets and runsForeign-Domestic. Entire libraries and smaller collections.WALTER J. JOHNSON, 125 East 23rd Street, New York 10,N. Y.

Journals, Periodicals, sets and runs. Also whole collectionsurchased for cash. J. S. CANNER & COMPANY, 909 Boylston

Street, Boston 15, Massachusetts.

BUSINESS OPPORTUNITIESChemist, Ph.D., comprehensive experience seeks associatewith capital to establish manufacturing concern. Box 530,SCIENCE.

EDITORIAL SERVICESTechnical-Scientific booklets, manuals, data, catalogs, pub-licity releases, special texts, written, published. Requestcircular. TECHNISCiENCE, 440 Foch, Mineola, New York.

SUPPLIES AND EQUIPMENTElectronic and electro-mechanical war surplus instruments,equipment and materials bought and sold. Descriptive stocklist sent upon request. Free procurement service on specificitems. ENGINEERING ASSOCIATES, Far Hills Branch, Box 26,Dayton, Ohio.

Time-saving Computing Devices - Nomograms, Charts,Tables, Graphs, Slide Rules made to order for any degreeof accuracy and range of values. H. D. RUDERMAN, 1533Townsend Ave., New York 52, N. Y.

Special Paper for Billrubin Test InUrine; see Hawkinson, Watson andTurner; J.A.M.A, Oct. 13, 14; pge.514, etc.

Schleicher & Schuell Co.Plant and Lab: South Lee, Mass.

Head Omfce: 116-118 West 14th St.New York 11, N. Y.

THE PORTER FELLOWSHIP.The American Physiological Society invites applica-tions for the Porter Fellowship, established throughthe generosity of the Harvard Apparatus Company.This Fellowship is tenable in any Institution otherthan the one in which the recipient Is working at thetime of application and Is available to any qualifiedphysiologist. It carries a stipend of $2,400 per annum.Applications for the year 1948-7 will be received untilSeptember 1. 19Nomination forms may be obtained from the Secre-tary, MAURICE B. VISSCHER, Department of Physiol-ogy, University of Minnesota, Minneapolis 14, Min-nesota.

Page 10: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

SCIENCE-ADVERTISEMENTS

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Page 11: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

1This microradiograph of a 0.002-inch specimen of aluminumalloy shows clearly the segregationof copper-rich components causedby hot rolling and reducing thematerial from its original ingotform. Mag on shown is 200X

"X-RAY VISIO-N"

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BY COMBINING the power of x-rays topenetrate with the ability of photog-

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wide range and the great variety ofphotographic materialswhichKodak pre-pares for microradiographic use, write...

EASTMAN KODAK COMPANY, ROCHESTER 4, N. Y.

Microradiography*..another important function of photography

Page 12: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

Dark-colored corpuscles, brilliantlines, and the subdued background ofthe Spencer Bright-Line Haemacyto-meter provide a strong contrast thatmakes cells easy to see and thereforeeasy to count accurately.Only the Bright-Line counting

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American w OpticalCOMPANY

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Page 13: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

SCIENCE-ADVERTISEMENTS

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Page 16: SCIENCE-ADVERTISEMENTS SCEE-DRTISEMENS2564 Clausen, F. D., D. Keck, and W. N. Hiesey. Experimental Studies on the Nature of Spe-cies. II Plant Evolution through Amphi-ploidy and Autoploidy

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Vol. 104, No. 268816

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