III I I 'I I

I

We've been doing it for 40 years with...

.'..9~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Environmental Rooms/Temperature Humidity Incubators

Over 500 standard sizes:bench-top to walk-in. Sub-Arctic Biological Freezers

From 7 to 17 cu ft.;-73 to -131°C.

Multi-Range Precision

Temperature Baths

Laminar-Flow fe(tialahClean Stations

Write or call for

further information. ENGINEERING, IC

1090 Springfield Rd., Union, N. J. 07083

6l74 (201) 686-7870 (212) 962-0332

Circle No. 93 on Readers' Service Card

Safer because all Time Tape Products are treated to interruptthe flow of bacteria, they are BACTERIOSTATIC. Safer becauseTime Tapes and Labels are pressure-sensitive, they eliminatea major source of contact infection, hand-to-mouth contact.Safer because Tinie Tapes and Labels provide instant visualcommunication of warnings and proper procedures.

More Efficient because Time Identification systems organize andcorrelate your LAB procedures.

There is a local Time dealer or representative near you. Contactus for his name, We will also send samples and literature onour complete line of Time Tapes and Labels.

PROFESSIONAL TAPE COMPANY, INC.DEPARTMENT 12

L ; 144 TOWER DR, BURR RIDGE (HINSDALE), ILL 60521

Circle No. 92 on Readers' Service Card

This Incubator-Shaker is

GUARANTEEDfor

400,000 MILESA 400,000-mile Guarantee for ashaker is really not much of abargain. In the life-span of anautomobile, 100,000 miles of usemay be a major achievement. But ashaking machine, used continu-ously, 24 hours a day, day-inday-out, runs the equivalent of100,000 miles in just 83.3 days.*And even then, NBS shakers are justgetting started. Although thisModel G25 Incubator-Shaker isguaranteed for 365 days (over400,000 miles), it has a life-expectancy of more than 10 years.Many are still in operation after 20years.

*(Based on an average auto speedof 50 mph 24 hours a day.)

23 MARCH 1973

ADVANCED FEATURES ...

Longevity is only one of theattributes of the G25. This modelprovides electronic speed controlfrom 40 to 400 rpm (indicatedon a direct-reading tachometer).Temperatures from near-ambient to60'C are regulated within +0.5°C.A main thermostat and a safetythermostat are employed. Tensionlock-knobs prevent accidental

change of settings. A key-lockinglatch mechanism secures theincubator chamber. When opened,a safety switchautomatically *'

shuts off the shaker.

Write for

No. G25S/373

NEW BRUNSWICK SCIENTIFIC CO., INC.1 130 SO ME RS ET ST PO BOX 606. NEW BR UN SW CK. NEW JE RS EY 08903

1261Circle No. 60 on Readers' Service Card

YOUR LAB IS SAFER,MORE EFFICIENT WITH

TIME PRODUCTS

couldC

u-_

m_

a~

Mon.-Fri,9am - 4:30pm, EastemTime. A photographic specialistis available to provide technicalassistance. Polaroid@9

B. Sedla"cek, Ed. Butterworths, London,1972 (U.S. distributor, Crane Russak, NewYork). vi, 280 pp., illus. $24.60. Also pub-lished as Pure and Applied Chemistry, Vol.31, Nos. 1-2 (1972).Management and Technology. Vol. 1,

An Anglo-American Exchange of Views.A meeting, London, 1972. Alan Mencherand Cyril C. Gee, Eds. Inforlink. ILondon,1972 (U.S. distributor, Pergamon, NewYork). Variously paged, illus. Paper,$12.50. Science Policy Foundation SpecialPublications Series.Many-Body Problems. G. E. Brown.

North-Holland, Amsterdam; Elsevier, NewYork, 1972. viii, 232 pp., illus. Paper.$13.75.The Meaning of Race. Phillip V. Tobias.

South African Institute of Race Relations,Johannesburg, ed. 2, 1972. iv, 42 pp.

Paper, $0.60.Metabolic Inhibitors. A Comprehensive

Treatise. Vol. 3. R. M. Hochster, MorrisKates, and J. H. Quastel, Eds. AcademicPress, New York, 1972. xx, 506 pp., illus.$26.

Natural Environments. Studies in Theo-retical and Applied Analysis. A workshop.John V. Krutilla, Ed. Published for Re-sources for the Future by Johns HopkinsUniversity Press, Baltimore, 1973. x, 352pp., illus. $16.50.New Perspectives on Ape and Human

Evolution. Adriaan Kortlandt. Stichtingvoor Psychobiologie, Amsterdam, 1972.100 pp. + map. Paper, $5.Newer Methods of Nutritional Biochem-

istry. With Applications and Interpreta-tions. Vol. 5. Anthony A. Albanese, Ed.Academic Press, New York, 1972. xviii,252 pp., illus. $16.50.

Nuclear Structure Theory. J. M. Irvine.Pergamon, New York, 1973. xiv, 478 pp.,illus. $27. International Series of Mono-graphs in Natural Philosophy, vol. 49.

Nutrition in Old Age. A symposium,Saltsjobaden, Sweden, Aug. 1971. Lars A.Carlson, Ed. Published for the SwedishNutrition Foundation by Almqvist andWiksell, Stockholm, 1972. 180 pp., illus.50 Sw. kr. Symposia of the Swedish Nu-trition Foundation, 10.On the Measurement of Human Fertil-

ity. Selected Writings of Louis Henry.Translated and edited by Mindel C. Shepsand Evelyne Lapierre-Adamcyk. Elsevier,New York, 1972. xxii, 228 pp., illus. $15.Population Council Book.

Optical Waveguides. N. S. Kapany andJ. J. Burke. Academic Press, New York,1972. xii, 328 pp., illus. $18.50. QuantumElectronics Principles and Applications.

Optimal Control of Differential andFunctional Equations. J. Warga. AcademicPress, New York, 1972. xiv, 532 pp.$27.50.

Organotin Compounds. Vol. 3. AlbertK. Sawyer, Ed. Dekker, New York, 1972.

xiv pp. + pp. 623-1078, illus. $32.50; bysubscription, $25.

Oxidation and Reduction of OrganicCompounds. Kenneth L. Rinehart, Jr.

Prentice-Hall, Englewood Cliffs, N.J.,1973. xii, 148 pp., illus. Cloth, $9.65;paper, $5.95.Pacem in Maribus. A conference, Val-

leta, Malta, June 1970. Elisabeth Mann

Borgese, Ed. Dodd Mead, New York,1972. xxxiv, 382 pp. $10.

The First Wide Range

Microtome-cryostat...

Temperatures from

-1sac tro o0c...

Frozen Sections

crom40op to1h .

The Harris LoTemp model WRCis two microtome-cryostats in

one. A single unit that can doboth routine diagnostic pro-

cedures and such sophisticated

research procedures as thinsection light microscopy, auto-radiography, fluorescence mi-

croscopy and other histologicalprocedures, at a cost compar-

able to presently availableroutine cryostats.The Harris model WRO is

compactr.e.p. can be moved any-

where it's needed. The cold

chamber has extra room for

tissue handling, storage or

freeze drying. Full opening top

with special access ports com-

bines the features of a totallyclosed system with the easy ac-

cessibility of open top models.

Available equipped with Jung

or International EquipmentCorp. microtomes, or cryostat

only prepared for installation of

your present l.E.C. microtome.Installed stereo zoom micro-

scope also available.

For a full description of the

Harris WRC and its wide range

of additional features write or

call .. .

Harris Manufacturing Co., Inc.308 River St., Cambridge, MA 02139(617) 864-4000

Circle No. 82 on Readers' Service Card

SCIENCE, VOL. 1791262

The Penguin Dictionary of Geology. D.G. A. Whitten and J. R. V. Brooks.Penguin Books, Baltimore, Md., 1973. 496pp., illus. + appendix. Paper, $3.45.Penguin Reference Books.Pharmacology of the Endocrine System

and Related Drugs. Progesterone, Proges-tational Drugs and Antifertility Agents.Vol. 2. M. Tausk, Ed. Pergamon, NewYork, 1972. xviii, 538 pp., illus. $36. In-ternational Encyclopedia of Pharmacologyand Therapeutics, section 48.

Photomicrography. Douglas Lawson.Academic Press, New York, 1972. xiv, 496pp., illus. $21.50.Photon-Hadron Interactions. R. P. Feyn-

man. Benjamin (Addison-Wesley), Read-ing, Mass., 1972. xviii, 282 pp., illus.Cloth, $16; paper, $7.95. Frontiers inPhysics.

Plant Growth Substances in Agriculture.Robert J. Weaver. Freeman, San Francisco,1972. xx, 594 pp., illus. $19.50.The Polaris System Development. Bu-

reaucratic and Programmatic Success inGovernment. Harvey M. Sapolsky. Har-vard University Press, Cambridge, Mass.,1972. xx, 262 pp., illus. $9.95.Polarons in Ionic Crystals and Polar

Semiconductors. An institute, Antwerp,Belgium, Aug. 1971. Josef T. Devreese,Ed. North-Holland, Amsterdam; Elsevier,New York, 1972. xviii, 808 pp., illus.$48.50.

Principles and Application of MagneticCooling. R. P. Hudson. North-Holland,Amsterdam; Elsevier, New York, 1972.xviii, 230 pp., illus. $20.75. North-HollandSeries in Low Temperature Physics, vol. 2.

Principles and Processes of Biology. M.J. Hollingsworth and K. Bowler. Chapmanand Hall, London, 1972 [U.S. distributor,Halsted (Wiley), New York]. x, 458 pp.,illus. $15.75.

Principles of Genetics. Irwin H. Her-skowitz. Macmillan, New York, 1973, x,630 pp., illus. $12.95.

Probability, Induction and Statistics. TheArt of Guessing. Bruno de Finetti. Wiley,New York, 1972. xxiv, 266 pp., illus.$17.95. Wiley Series in Probability andMathematical Statistics.

Progress in Aerospace Sciences. Vol. 13.D. Kiuchemann and seven others, Eds.Pergamon, New York, 1973. viii, 302 pp.,illus. $30.

Progress in Optics. Vol. 10. E. Wolf, Ed.North-Holland, Amsterdam; Elsevier, NewYork, 1972. xvi, 394 pp., illus. $34.50.

Progress in Peptide Research. Vol. 2.Saul Lande, Ed. Gordon and Breach, NewYork, 1972. x, 394 pp., illus. $19.50.

Psychology and Contemporary Affairs.Nathaniel J. Ehrlich. Brooks/Cole, Mon-terey, Calif., 1972. xiv, 336 pp., illus.Paper, $4.95.Psychology and the New Consciousness.

Ernest Keen. Brooks/Cole, Monterey,Calif., 1972. viii, 152 pp. Cloth, $5.95;paper, $3.95. Contemporary PsychologySeries.

Psychology and Visual Aesthetics. R. W.Pickford. Hutchinson Educational, London,1972 (U.S. distributor, Crane Russak, NewYork). xviii, 270 pp. + plates. $16.25.

Radioactive Tracers in Hydrology. E.Gaspar and M. Oncescu. Translated fromthe Romanian edition (1967) by Magda-lena Marinescu. Editura Academiei,

23 MARCH 1973

Rush Me Harshaw File No.NAM E

COMPANY

ADDRESS

CITY -STATE ZIP_

Harshaw International

doseawM heernHol THE HARSHAW CHEMICAL COMPANYPostbus 19, DIVISION OF KEWANEE OIL COMPANY

Poshawchemie GmH j CPYStal & Electronic Products Department5678 Wermelskirchen 6801 Cochran Road . Solon, Ohio 44139 .Federal Republic of Germany (216) 248-7400

Circle No. 40 on Readers' Service Card 1263

CONCENTRATE

0.15 mlsamples up

to 20x

New, Disposable

MINICON;Aconcentrators* No centrifuge* No technician attention* No pressure or vacuum* Eight cells per unit* Choice of 25,000 or 75,000MW cut-off

ORDER TODAY!5 MINICON-A Concentrators(40 cells) for just $24.00, pluspostage. For more informationsend for Publication 431.

amIcon21 Hartwell AvenueLexington, Mass. 02173(617) 862-7050 * TELEX 92-3451

Bucharest; Elsevier, New York, 1972. 342pp., illus. $18.95. Developments in Hy-drology, 1.Random Integral Equations. A. T.

Bharucha-Reid. Academic Press, NewYork, 1972. xiv, 268 pp. $17.50. Mathe-matics in Science and Engineering, vol. 96.

Rattlesnakes. Their Habits, Life His-tories, and Influence on Mankind. Lau-rence M. Klauber. Published for theZoological Society of San Diego by theUniversity of California Press, Berkeley,ed. 2, 1972. 2 vols., boxed. Vol. 1, xxxpp. + pp. 1-740, illus. Vol. 2, xviii pp.+ pp. 741-1534, illus. $50.Red Rock Country. The Geologic His-

tory of the Colorado Plateau. Donald L.Baars. Natural History Press (Doubleday),Garden City, N.Y., 1972. vi, 264 pp., illus.$9.95.

Regeneration in Lower Vertebrates andInvertebrates m. Papers by Victor B. Eich-ler and others. MSS Information Corp.,New York, 1972. 186 pp., illus. $15.

Reports on the Progress of AppliedChemistry during 1971. Vol. 56. Publishedfor the Society of Chemical Industry byAcademic Press, New York, (1972 avail-able from Chemical Society, BlackhorseRoad, Letchworth, Hertfordshire, Eng-land). x, 806 pp. £10.

River Morphology. Stanley A. Schumm,Ed. Dowden, Hutchinson, and Ross,Stroudsburg, Pa., 1972. xii, 430 pp., illus.$18. Benchmark Papers in Geology.

Rubella. A symposium. Herman Fried-man and James E. Prier, Eds. Thomas,Springfield, Ill., 1973. xiv, 148 pp., illus.$9.25. American Lecture Series, No. 867.

Schizophrenia and Genetics. A TwinStudy Vantage Point. Irving I. Gottesmanand James Shields. Academic Press, NewYork, 1972. xviii, 434 pp., illus. $19.50.Personality and Psychopathology, vol. 13.

Science against the People. The Story ofJason. Scientists and Engineers for Socialand Political Action, Berkeley, Calif.,1972. iv, 44 pp., illus. Paper, $1; 10 copiesor more, $0.65.

Science in the World around Us. Wil-liam C. Vergara. Harper and Row, NewYork, 1973. vi, 250 pp., illus. $7.95.

Scientific Publications, 1971. EastmanKodak Laboratories, Rochester, N.Y.,1972. Section 1, Organic Chemistry, Poly-mer Chemistry, Biological Chemistry. xxiv,94 pp., illus. Section 2, Analytical Chem-istry, Physical Chemistry, Chemical En-gineering. xxvi, 92 pp., illus. Section 3,Physics, Mathematics, Engineering. xxvi,164 pp., illus. Section 4, Photographic Sci-ence and Technology. xxvi, 110 pp., illus.The Scope of Motivation. Environment-

al, Physiological, Mental, and Social. Wil-son McTeer. Brooks/Cole, Monterey,Calif., 1972. viii, 232 pp. illus. $4.95.Core Books in Psychology Series.

The Seas in Motion. F. G. WaltonSmith. Crowell, New York, 1973. viii, 248pp., illus. $7.95.

Simple Groups of Lie Type. Roger W.Carter. Wiley-Interscience, New York,1972. viii, 332 pp., illus. $19.95. Pure andApplied Mathematics, vol. 28.

Soil Mechanics in Foundation Engineer-ing. Vol. 2, Theory and Practice. ZenonWitun and Krzysztof Starzewski. Halsted(Wiley), New York, 1972. xviii, 222 pp.,illus. $10.75.

Circle No. 80 on Readers' Service Card

Solar-Terrestrial Physics. An Account ofthe Wave and Particle Radiations fromthe Quiet and the Active Sun, and of theConsequent Terrestrial Phenomena. Syun-Ichi Akasofu and Sydney Chapman. Ox-ford University Press, New York, 1972.xxiv, 902 pp., illus. $80. InternationalSeries of Monographs on Physics.

Structure and Bonding. Vol. 12. J. D.Dunitz and seven others, Eds. Springer-Verlag, New York, 1972. iv, 296 pp., illus.Paper, $22.90.The Superalloys. Chester T. Sims and

William C. Hagel, Eds. Wiley-Intersci-ence, New York, 1972. xiv, 614 pp., illus.$29.95. Wiley Series on the Science andTechnology of Materials.Theory of Ionospheric Waves. K. C.

Yeh and C. H. Liu. Academic Press, NewYork, 1972. xiv, 466 pp., illus. $24. Inter-national Geophysics Series, vol. 17.Thermodynamics of Solids. Richard A.

Swalin. Wiley-Interscience, New York,ed. 2, 1972. xii, 388 pp., illus. $19.50.Wiley Series on the Science and Tech-nology of Materials.

Transplantation Antigens. Markers ofBiological Individuality. Barry D. Kahanand Ralph A. Reisfeld, Eds. AcademicPress, New York, 1972. xxvi, 536 pp.,illus. $26.50. Immunology.Underwater Sound. Vernon M. Albers,

Ed. Dowden, Hutchinson, and Ross,Stroudsburg, Pa., 1972. xii, 468 pp., illus.$20. Benchmark Papers in Acoustics.Uptake of Infonnative Molecules by

Living Cells. A school, Mol, Belgium,Aug. 1970. L. Ledoux, Ed. North-Holland,Amsterdam; Elsevier, New York, 1972. xii,416 pp., illus. $32.50.The Urban Future. Ely Chinoy, Ed.

Lieber-Atherton, New York, 1973. x, 180pp., illus. Cloth, $7.95; paper, $2.95.The Use of the Scanning Electron Micro-

scope. J. W. S. Hearle, J. T. Sparrow, andP. M. Cross. Pergamon, New York, 1972.xii, 278 pp., illus. $26.50.

Variations and Connections of the Hu-man Thalamus. J. M. Van Buren and R.C. Borke. Springer-Verlag, New York,1972. 2 vols. Vol. 1, The Nuclei and Cere-bral Connections of the Human Thalamus.xiv, 472 pp., illus. Vol. 2, Variations of theHuman Diencephalon. vi, 116 pp., illus.The set, $196.60.

Vitamins and Hormones. Advances inResearch and Applications. Vol. 30. Rob-ert S. Harris, Paul L. Munson, Egon Dicz-falusy, and John Glover, Eds. AcademicPress, New York, 1972. xii, 394 pp., illus.$20.Who Wakes the Groundhog? Ronald

Rood. Illustrated by Carrye E. Schenk.Norton, New York, 1973. 206 pp. $6.95.Why People Play. M. J. Ellis. Prentice-

Hall, Englewood Cliffs, N.J., 1973. xvi,174 pp., illus. $8.95.WMO Helps the Developing Countries.

World Meteorological Organization, Ge-neva, 1971 (U.S. distributor, Unipub, NewYork). 86 pp. Paper, $1. WMO No. 307.World Directory of Veneral-Disease

Treatment Centres at Ports. RepertoireMondial des Centres de Traitement pourMaladies Veneriennes dans les Ports.World Health Organization, Geneva, ed.3, 1972 (U.S. distributor, American PublicHealth Association, Washington, D.C.).196 pp. Paper, $6.

SCIENCE, VOL. 179

Our specially designed acrylic plastic hood converts Shaker BathModel 604500 instantly into an ambient to 600C dry heat incubator.Heating elements are safely located beneath the bath floor.Adjustable thermostat control,* automatic safety thermostat,stainless steel interior and exterior construction and remote bulbthermometer are also included. Stainless steel gassing hood isoptional. Hotpack Corporation, 5086 Cottman Ave.,Phila., Pa. 19135.

_ I * _ l I* It||

WHERE QUALITY COUNTSCircle No. 95 on Readers' Service Card

S11S0 0S e

Dexamethasone [1, 2, 4-2H(N)J NET-41530-50C0/mmole $45/250.LCi $85/1 mCi $320/5mCiPrednisolone 16, 7-3H(N)l NET-40640-60Ci/mmole $47/250,uCi $90/i mCi $350/5mCiCorticosterone [1, 2-3H(N)l NET-18240-60Ci/mmole $32/25OpCi $72/1 mCi $21 5/5mCiCorUcosterone [1,2,6, 7-3H(N)l NET-39980-1 05Ci/mmole $43/250,Ci $85/1 mCi $235/5mCiHydrocortisone [1, 2-3H(N)] NET-18540-60Ci/mmole $32/250uCi $72/i mCi $21 5/5mCiHydrocortisone t1, 2, 6, 7-3H(N)I NET-39680-1 0OCi/mmole $43/250,uCi $85/1 mCi $235/5mCiPackaging: Benzene:ethanol solution, 9:1, in combi-vial.

I> New England Nuclear575.Albany Street, Bton, Mass. 02118Customerservice 617482-9595

NEN Canada Ltd., Dorval. Quebec; NEN Chemicals GmbH. Dreieichenhain, Germany.

Circle No. 94 on Readers' Service Card

Fishing aroundfor gift ideas?

Why not give

SCIENCE:-the weekly magazine of research?

a $16 USA a $18 Canada, PUAS a $19 Foreign

a $32 Airlift, available for Europe, North Africa, Near East.(PLEASE PRINT to ensure accuracy.)

AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE1515 Massachusetts Avenue, N.W., Washington, D. C. 20005

E Please enter the following gift subscriptions:Recipient

Name

Address

City State Zip

O Send gift card and sign.

Recipient

Name

Address

City State Zip

O Send gift card and sign

L Check here to enter (or extend) your own subscription.Q New Q Renewal (attach Science label)

Name

Address

City State Zip

O 1 enclose $ for subscriptions.

Q Bill me $ for subscriptions.

Signature323

23 MARCH 1973

n n~~~~~~~.

101111POSITIONS WANTED __llBiochemist/Microbiologist (Immunology), Ph.D.Expertise: humoral aspects of tumor immunology.Broad background includes virology, tissue cul-ture, analytical and biophysical methods. Box 162,SCIENCE. X

Biomedical Area-Research and teaching. Ph.D.Strong basic background in microscopic anatomy;embryology; and biomedical instrumentation-electron microscopy, transmission and scanning,microprobe, and so forth. Research specializationin ultrafine structure cardiovascular area. Numer-ous publications. Box 163, SCIENCE. X

Excellent, Energetic Biologist. Ph.D. (genetics,1965), 37; 10 years' full-time university, 5 years'other professional experience. Postdoctoral (hu-man genetics). Special interest experimental teach-ing, curriculum development. Desires positioncommensurate with experience in departmentseeking new approaches to undergraduate educa-tion. 2266 Lake Circle, Jackson, Mississippi 39211.

3/23

Histologist/Experimental Hematologist, Ph.D.Seeks challenging teaching/research or creativeresearch position. Research interests-humoralregulation of normal and leukemic hemopoiesis,stem cell kinetics, in vitro and in vivo hemo-poietic colony regulation. Teaching experience-istology, experimental hematology, comparative

hematology. 20 + publications. Box 141, SCI-ENCE. 3/23, 30; 4/6, 13

Organic Chemist with 18 years' association withcancer research and extensive experience in hydro-carbon metabolism work seeks change to a cancerinstitute. Box 127, SCIENCE. 3/23

Ph.D. Physicist, Fellow Phys. Soc., with fine re-search accomplishments (experimental). Teachingexperience at university level. At present withmajor industrial laboratory. Seeks position with4-year college where he can participate in, up-grade, or set up a good physics or science-mathe-matics program. Some management expenence.Box 67, SCIENCE. 3/23, 30; 4/6

Physicist, Ph.D., 1971. Research with NASA.Teaching experience interdisciplinary curriculumdevelopment at elementary, secondary levels. Sci-entific publications. Presently engaged in matheducation research at major university. Seeksacademic position: teaching, curriculum innova-tion, research in science/math education. Box 149,SCIENCE. 3/23

Physicist, Ph.D. Experimental nuclear physics;strong biological interest. Experience in vivoradiopharmaceutical dynamics, radiation physics,animal surgery, nuclear medicine, isotope produc-tion, computers, electronics, taught all physicsmajors courses. Seeks medically related positionin academic environment. Box 129, SCIENCE.

x

Ph.D. Virology-Immunology; B.S., M.S. bacteri-ology (biochemistry-statistics); desires teachingand/or research position. Box 164, SCIENCE. X

POSITIONS OPEN 11111i||

ASSISTANT PROFESSOR, DEPARTMENT OF

BIOCHEMISTRY, University of California, River-side Campus. Ph.D. in Biochemistry required plusresearch experience and interests in an area ofmolecular biology related to systems involvinghigher animals. Duties include teaching of bio-

chemistry at the undergraduate and graduate levelsand supervision of graduate student dissertationresearch. Eleven-month appointment at a salary of

approximately $14,400 per year. The University ofCalifornia is an Equal Opportunity Employer.Write to R. T. Wedding, Chairman, Departmentof Biochemistry, University of California, River-

side, Calif. 92502.

ASSISTANT PROFESSOR OF BIOCHEMISTRYWith background and interests to support a de-

veloping program in the Chemistry of Behavior.Send resume, three references, and statement of

research interests to Dr. W. B. Smith, Departmentof Chemistry, Texas Christian University, Fort

Worth, Texas 76129. TCU is an affirmative action/equal opportunity employer.

1266

POSITIONS OPEN POSTONS OPEN

ASSISTANT OR ASSOCIATE PROFESSOR(Biochemistry) depending upon qualifications, re-quired for the fall 1973. Applicants should possessa Ph.D. degree and have research experience.Position will require teaching at both the under-graduate and graduate leveL as well as the estab-lishment of a research program. Departmental re-search interests are presently in periodontal andglandular tissues, secretory phenomenon, metabo-lism of oral microfiora, enzyme regulation, bonebiosynthesis and metabolism. Preference will begiven to candidates with a dental degree inaddition to a Ph.D.For further information write: Head, Depart-

ment of Oral Biology, Faculty of Dentstry, Uni-versity of Manitoba, Winnipeg, Manitoba, R3EOW3, Canada.

ASSISTANT PROFESSOR OF BIOLOGY-Ph.D. Position available 1 Septembei- 1973 forteaching and research at undergraduate andgraduate levels, including supervision of Ph.D.dissertations. Applicants should submit a curricu-lum vitae, reprints, a statement of teaching andresearch interests, and the names of three refer-ences by 1 April 1973 to Search Committee, Biol-ogy Department, Lehigh University, Bethlehem,Pa. 18015. Applications from women and membersof disadvantaged minority groups are encouraged.

Assistant Professorship in Chemistry beginningfall 1973. Emphasis on both research and teach-ing. Preference for applications of magneticresonance in research. Further information fromPaul Haake, Department of Chemistry, WesleyanUniversity, Middletown, Connecticut 06457. Anequal opportunity, affirmative action employer.

ASSISTANT PROFESSORPosition available 1 July 1973 in the Departmentof Dermatology, University of Michigan MedicalSchool. Candidate must be Board eligible orBoard certified. Desire an academically orienteddermatologist who will be required to teach andwho will have patient care and research re-sponsibilities. Code _#200J. Send r6sum6 to Box158, SCIENCE. A Nondiscriminatory AffirmativeAction Employer.

ASSISTANT PROFESSOR, MICROBIOLOGISTin Department of Biology, for 15 August 1973.Ph.D., specialization in microbial physiologydesired, duties to include teaching of General Bac-teriology and development of advanced courses infield. Submit curriculum vitae, transcripts, threeletters of recommendation, and photo to B. L.Monroe, Chairman Department of Biology, Uni-versity of Louavils;, Louisville, Kentucky 40208.An equal opportunity, affirmative action employer

ASSISTANT PROFESSOR

Position available in the Department of Obstetrics& Gynecology, University of Michigan MedicalSchool. Candidate must have a Ph.D. in Mam-malian Reproductive Physiology. Must be experi-enced in endocrine surgical procedures in mam-malian fetuses in utero and able to conduct in-dependent research. Must be able- to develop Ph.D.training programs and to participate in teachingprograms for medical students and house staff.Send r6sum6 to Box 159, SCIENCE. A Nondis-

criminatory Affirmative Action Employer.

ASSISTANT or ASSOCUATE PROFESSOR

Position available immediately in the Departmentof Neurology, University of Michigan Medical

School. Candidate must have M.D. degree, post-doctoral training in clinical neurology, be certified

in neurology by the American Board of Psychiatryand Neurology, and have experience as a clinician,teacher and investigator. Code #200J. Send r6sum6to Box 160, SCIENCE. A Nondiscriminatory Af-

firmative Action Employer.

ASSISTANT PROFESSOR OF PATHOLOGY

University of California, San Francisco. Begin-ning 1 July 1973 or later. Excellent opportunityfor M.D. with training in anatomic pathology and

skilled in electron microscopy. Prefer candidate

with strong teaching and research interests. Will

direct EM unit (two technicians, Siemens IA elec-

tron microscope), examine biopsy specimens, per-form independent research, participate in teachingpathology to undergraduate students. Applicantsrequested to submit curriculum vitae by 15 April1973 to: Chairman, Department of Pathology, The

University of California, San Francisco, Califor-

nia 94122 (a Nondiscriminatory Affirmative Action

Employer).

BIOCHEMICAL ENDOCRINOLOGIST, BOTA-

NIST, MEMBRANE BIOCHEMIST. Permanent

faculty positions open fall 1973 for persons inter-

ested in teaching one class per semester and

showing promise in independent research. Un-

usual opportunities for quality researchers in

large, young faculty that is in new building and

has had NSF Development Award. Postdoctoral

experience required. An equal opportunity em-

ployer. Send resum6, doctoral transcript, refer-

ences to Dr. L. Evans Roth, Division of Biology,Kansas State University, Manhattan, Kansas

66506.

BIOCHEMIST Ph.D.Biochemist experienced in protein and glycopro-tein fractionation. Candidates should have pro-ficiency with various fractionation techniques,GLC, and be able to lead group efforts. Inter-ested candidates send curriculum vitae, refer-ences, and publications to:

Dr. B. MacklerLitton Bionetics, Inc.7300 Pearl Street

Bethesda, Md. 20014

DEPARTMENT OF BIOLOGYHARVARD UNIVERSITY

Prior to 1 July 1974 this department expectsto make an appointment at the assistant profes-sor level. The field in which the appointment willbe made is animal cell biology. The Universityis an equal opportunity employer; women andmembers of minority groups are specifically en-couraged to apply. Please have three professionalpersons write us concerning you, and send yourr6sum6, together with your most significant pub-lications, to Cell Biology Search Committee, Bio-logical Laboratories, Harvard University, 16Divinity Avenue, Cambridge, Massachusetts02138.

CHAIRMAN FOR MICROBIOLOGYDEPARTMENT

Young vigorous applicants are encouraged to ap-ly. Specialization in immunology is required.Wank and salary depend on qualifications and ex-

perience. Department offers B.A., M.A., andPh.D. degrees. Appointment is effective Septem-ber 1973. Applications including curriculum vitae,transcripts, and three letters of recommendationshould be sent to Dr. Charles M. Vaughn, Chair-man, Search Committee, Department of Zoology,282 Upham Hall, Miami University, Oxford, Ohio45056. An Equal Opportunity Employer.

UNIVERSITY OF KENTUCKYCHAIRMAN, DEPARTMENT OF

BIOCHEMISTRYApplications or nominations are invited for

Chairman and Professor, Department of Bio-chemistry, University of Kentucky College ofMedicine, Lexington. Candidates should be out-standing biochemists with nationally recognizedexcellence in research plus a commitment toteaching both medical and graduate students.

Deadline for receipt of applications is 1 April1973. Send curriculum vitae and a list of threereferences to: Dr. John J. Hutton, Department ofMedicine, University of Kentucky, Lexington, Ken-tucky 40506. An Equal Opportunity Employer.

CHIEF SCIENTIST (BIOLOGY)Biological Survey, New York State Museum andScience Service. Has responsibility for adminstra-tion, guidance, and coordination- of research andadvisory services in the broad areas of botany,entomology and zoology. Conducts personal re-search in his/her particular discipline. A speciali-zation in forest entomology or forest biolpgywould be preferred. Competitive salary, excellentbenefits. Send r6sum6 to Mr. George Delamar,Box 1, Personnel, State Education Department,Albany, New York 12224.

An Equal Opportunity EmployerDIRECTOR, INSTITUTE OF PUBLIC POLICYSTUDIES, University of Michigan, Ann Arbor.The Institute is an interdisciplinary research cen-ter with responsibility for graduate programs inpublic policy and administration. Professionalstaff and curriculum are drawn primarily fromeconomics, political science, management sci-ences, and law. Director is chief executive officerfor both research and teaching activities. Direc-tor must have demonstrated outstanding compe-tence in research, must be prepared to teach ingraduate program, and must have strong adminis-trative capability. Experience in government or inpolicy research desirable. Additional appointmentin academic department is expected. Salary com-mensurate with experience. The University ofMichigan is a nondiscriminatory affirmative actionemployer. Send r6sum6 to Donald E. Stokes,Dean, Horace H. Rackham School of GraduateStudies, University of Michigan, Ann Arbor,Michigan 48104.

DIRECTOR OF ADMINISTRATIONThe Learning Research and Development Cen-

ter of the University of Pittsburgh, an instituteconducting research, development, evaluation andgraduate training related to the learning andpsychological development of young children, isseeking a director of administration. Functionsinclude fiscal management and planning, man-

agement of personnel and technical services, andliaison with funding agencies and other educa-tional R & D organizations. The director mayconduct independent R & D work within the Cen-ter and may hold a faculty appointment withinthe University. Principal requirement is demon-strated ability as a research administrator; salarydependent upon qualifications.

Send curriculum vitae and letter stating availa-bility to Dr. Robert Glaser, LRDC, Universityof Pittsburgh, Pittsburgh, Pa. 15213.An Equial Opportunity/Affirmative Action Employer

SCIENCE, VOL. 179

............ ...^

-

1..t

POSITIONS OPEN

MINNESOTA GEOLOGICAL SURVEY

The position of Director of the Minnesota Geo-logical Survey will be available in the summer of1973. The Director will be responsible for pro-viding an active, modern program of basic andapplied geological research, geological service,and geological education for the people ofMinnesota. Candidates should hold a Ph.D. ingeology or related field and have several yearsof professional geological experience. The posi-tion carries a professional appointment in theDepartment of Geology and Geophysics of theUniversity of Minnesota, with modest teachingresponsibilities. Interested persons should sendresume and names and addresses of three refer-ences to H. E. Wright, Department of Geologyand Geophysics, University of Minnesota, Minne-apolis, Minn. 55455. The University of Minnesotais an equal opportunity employer.

JUNIOR SCIENCE WRITER

with training in nutrition, or allied fields, totranslate technical resource material for lay audi-ences, to interpret nutrition research to educa-tional-health professional communities, trade press,to edit other material for related interpretationpieces. Should have sound background with adegree in nutrition, journalism, or communications.Writing experience required. Full fringe benefits.Salary competitive. Send resum6 to:

Executive AssistantNational Dairy Council111 North Canal StreetChicago, Illinois 60654

ELECTRON MICROSCOPISTFaculty position open in Department of Micro-biology, Mount Sinai School of Medicine of theCity University of New York, for independentinvestigator to direct research and teaching inrelation to bacterial or viral ultrastructure. Aca-demic rank and salary will depend on qualifica-tion. Only written communications includingcurriculum vitae and bibliography will be con-sidered. Address to Dr. E. D. Kilbourne, 10East 102 Street, New York, New York 10029.

An equal opportunity employer

DIRECTOR OF MEDICAL TECHNOLOGY/MEDICAL SCIENCES ADVISOR

Administration of established program includingliaison with cooperating hospitals plus advisingof preprofessional students in medical sciences.A graduate degree in biology or health-relatedscience is required. Send resume and inquiriesto Dean Loew, College of Arts and Sciences,Western Michigan University, Kalamazoo, Mich-igan 49001.

SCHOOL OF BASIC MEDICAL SCIENCESUNIVERSITY OF ILLINOIS, URBANA

Three new positions in GROSS ANATOMY,NEUROANATOMY, and MICROSCOPICANATOMY are available either September 1973or 1974 for one senior person and two juniorpersons. The curriculum is unique and innova-tive, requiring close cooperation between campusfaculty and community physicians. Applicantsmust have demonstrated outstanding researchpotential with research interests related to medicalsciences and must be competitive for researchfunding at the national level. Equal opportunitiesexist for qualified women and minority groupmembers. Deadline date for applications is 3weeks from publication of this notice. Send ap-plications, including curriculum vitae, publica-tion list, reprints, and at least three letters ofrecommendation to the Chairman of the SearchCommittee, Dr. Ray L. Watterson, Departmentof Zoology, University of fllinois, Urbana, 11-Hlnois 61801, who will be available for inter-views at the meeting of the American Associationof Anatomists 8 through 12 April.

LABORATORY VETERINARIANApplications are invited for the position ofLaboratory Veterinarian at the UT-AEC Agri-cultural Research Laboratory. The principalduties are to provide veterinary care for experi-mental animals (principally swine and cattle)used in research, to perform surgical proceduresin support of research programs, and to serve asdrug control officer for the Laboratory. Minimalrequirements are a degree in Veterinary Medicinefrom an approved school and eligibility forlicensure in Tennessee. The position will carryfaculty rank at the University of Tennessee. Thisrank and salary are negotiable. Inquiries shouldbe sent to Dr. T. R. Noonan, Coordinator ofAnimal Research, 1299 Bethel Valley Road, OakRidge, Tennessee 37830. The University of Ten-nessee is an affirmative action employer.

CircleNo.90onReaders'ServiceCard

Circle No. 90 on Readers' Service Card

P-L Biochemicals, Inc., }-proudly announcespublication of thelatest edition of theINTERMEDIARY- :

H. J. Sallach, Ph.D., Author W

* Thoroughly up-dated and reviseda New sections addeda Expanded new 4-chart format(each 23"1 x 34"1)Chart section shown one-half size. bi -

New spiral binding and wall hangerHigh quality 5-color reproductionon heavy-duty paper AX

*Formerly pubished byGilson Medical Electronics c

(ah2"x3",,S.-:-B,----------- --

sciIh Please sehd sets of charts @ $3.75 each(less 25% for 25 sets or more). Enclosed find $(Check or money order only; Do not send cash)el Please send additional information.

NameStreet

City State Zip

P. 0. Box 4606, Chicago, Illinois 60680, U.S.A.

Circle No. 91 on Readers' Service Card 1267

ClinicalResearch

to assist in: designing, monitoring& evaluating clinical studies; prep-aration of new drug submissionsto the F.D.A.

B.S. in Biological science plus1-3 years' experience in clinicalresearch and/or regulatory af-fairs. Must be able to communi-cate with important physicians.Excellent salary.Qualified applicants please for-ward resume with salary historyto: John A. Chaya, Manager Em-ployment.

,ORTHO DIAGNOSTICS

Route 202, Raritan, N.J. 08869(A Johnson & Johnson Co.)

an equal opportunityand affirmative action employer

New From Klett4 Vertical Gel Electrophoresis Cells

FEATURES* Transparent lucite body.* Full view of gel columns during preparation.* Full view of dye front.* All safety features.* Precision ground channels.* Leveling legs.* Rapid, simple and complete removable of gelcolumns with spatula.

Kilett Manufacturing Co., Inc.179 E. 87th Street, New York, N. Y. 10028 -1

|||fIIIIIA |!|AIl|IOS|PITIO ' S O PE, ' ||||||||||||||||||||||||||

I ('I RL R P'OSITION AN AII ABL

I,iM ri ot HiBioloug Lahormtors I ccitierr is Opclltier A LueLLst 1973 S iUcCCSSfUl CartlCidic atCs will is-ttL111C fulI responsihility for the Uncdermrmr.duLi,i

cuto-e labhoratotries. C anididatcs miuist hiive it lhestan NI S. in Biologs, with trairiitig ini I Coloey,1lihNsioligx, De)velopment, Gcilettics. aind Biocthimil-

i-rsN leaching experience is cdesirable SItsry tt()IilIl()il, aind alppoititritetit is eerienw.hle oil

ii-t -ycuar hasis Seind c Urriuculuim svitac to

Neil NWelkerlDepatrtment of Biological SciencesNorthwestern U niversityFI anston, Illinois 60201

Ali IEqual OppoertiitiFi lluI )IIt t

Excellent career positions in the areas

of liprd metabolism, atherosclerosis and

cardiouascuJlar pharmacology.We are seeking 2 highly motivated

scientists with a Ph.D. in Pharmacology,B!ochemistry, Physiology, or allied sci-

ences to participate in expanding re-

search projects directed to the treatment

of cardiovascuilar diseases.We offer comprehensive fringe bene-

fits, good growth potential and competi-tive salaries in a desirable New York

Crty suburban location.Send complete r4sume, incluLding sal-

ary histury and requirements. iti confi-

den ce to Mr. C. L. Hill.

LEDERLE LABORATORIESAmerican Cyanamid Co.

Pearl River, New York 10965

At If qua!il Opporttuitit Emtploycr M D

1)t7KE UNIX ERSITY FA\CULTY POSITION

l)epartment of Botany. Plant Phy1iologist.beginniiing ALutlmnll 1974

Applicatitns are invited front plint physilogistswho base demonstrated excellence in research andtc iclitrg. First order of priority is for a pcersonwhose research initerest aiid puhlcationi -cordi is

itn thec area of photossnthcsis, photohuiology, or

11 nurnihrhie c systems The appoiuntce ill heespected to develop an active researchi aid

graldUate training progralrl .ind to participate HILatidergraIdUate teaching.

Applications mtust tidcclad ciirric ulutIL s ItIC.sclecied reprints of published papers. atid thetames of three referecss Send the information toProf. Auibrey W. Na blor, Chairman of SearchComnmittee, lDepartment of Botany, D)uke U mser-sity, Durham, North Carolinia 2770i6.

I)iuk Lrn viver iii ias t ()(ili?pp tunitYEmiplo ier

POSTDOCTORAI RESEARCH IN BOCHIEN1-IStIRY: Positiorl asvaillble in Jtune 197 for re-seltrch otl the biosynthesis of tranisfer RNA. Ap-p1 iCat ts shouLld have lth.I). in molecular hiology,huophi sics or huochemllistry;, tenlulre I to 2 yvears.Snud restinle to:

Dr. NI. J. FournierDepartmcent of Biochemistry

niversity of MassachnisettsAmherst, Nlass. 01002

Tle Lvescsity of Niassac husetts is ;III ectialopportiinltv employcr and hoth fem-ale andnintiority ipplic ants are tirged to applyRESEARCH ASSOCIATE or POSTDOCI'ORAI.

FELILOWlios ti otiO uttititedialets'l asai lilahle stidlsI iiog the

cT1/Nsm tic processes insvotsed in T forma

tion. I-sxpcrietice it protein cheitistrs or proteinsc qienc ritn desirable.

TECHNICIANF xperience in hboclteritistry prefcrred. DUties in-

loIde preparation of bat terial s iruses and ex-pC 1i iln its i isoIsVl,tre CiItoliuir cItronmatoigrapis-. ge

cccitrophlorcsis, and S( forth

Apply tct Dr. Nlichael K. Showe, Biology De-partment, Havertord College. Havertord. Pa.19041.

RESP'IRATORY PHYSIOILOGIST/PHARNlMACOLOGIST

irvisersitv Niecdical Cetiter researchl lahtoratorNseeks caindidadts ititcrested in aipplying tlte prin-ciplIes otilpulmonary mecliatiics to cilronic in-hallatiott aiid cliniical druLu(. stuLdies.

Scurd coLrricLtiltiti vitae totBOX 161, SCIENCF

Ani (jiual Op/rlrOtrititin[i.)Pipl/oiciSTA ISTICAL LABORATORY

OF lTUE%IATE U'NIV'ERSIIY OF NEW YORK ALr

Bt FFALOTwito positionis airc asvalIthbl for Ph. statisticianstriaincd in thleory atid applications, Primary re-sonsuhuilities within the ahoratory are forscientific collaborationi on the planiting, coltIctct,and analysis of ctiiticatl trials in caticcr. Op-portuntiities exist for teaching and rcsearcIi withinthe L[ahoratory aiid ttirouglh j(oint appointmenitss sithi Lniversity deprtiments. Applicants Sho01lIdsculd full cUirritiltILI and emptoyment vitae aswelt a nmnics if thiree refert nces to Janies S.

illianis, Statistical LIaborator., State U nisersityot New ork at Buffalo, 42310 Ridge Lea Road.Anmherst, New Vork 14226.

TERRESTRIAL ECOLOGISJ

lirctctrably wit hubotanical ititerests, for ait as-sistint proftfssorshlip. Send ctmplcte resuime, in-chtiditIg pUiblications. list of recommenders. andlrescarcli interests to Chairman, Department ofBiology, Unisersity of Pennslsania, Philadelphia.Pa. 19174.

A,i t.' iuil Oppr ortimtu itii Liit lovt i.r

ZOOI OGY DEPARTMFNJPOMONA COLLEGE

A I-ycar appoititieictit for a rccetit Ph.D. itt

Biology or Zotlogy. To teacil courses, with lab-oratory, ini eithcr C ell Physiology or Compara-tIsc Vcrtebrate Aitatonty ottc sentester, inD)evelopmeiital Biology or Vertcbrate Deselop-itctit the othicr senicster, aind a semintar in a

field of competciicc either sentester. PleasC suIh-ltlllt CirricUlIm sitac and the names if threcretferences hy April 25 t):

Dr. William DeWitt AndrusZoology DepartmentPomona College

Claremont, California 91711

ZOOLOGISTlit 1). to cooperate ill developitig aind uIsillg mot-

crii technology to teach biology to large nUmbers

of niotmajors. Advancement hased ort cre.itivityitt teaching aitcd research prodLuctivity. Applicanrtsi!10tU1d sitbmctit ctlrric ultitti vit.ie and sLtmtinarize

pr-parattition aid experictlce for this positiolt toDr. Ni. R. Iee, Zoology Department, Unisersityof Illinois, rbana-Chanmpaign 61801, by 25 April.A nondiscrimtttnatory eqLial opportutnits emploser.Women aicnd ittenibttrs if itlinorits eruLtIps iare

eticoturiec cd to appsy.

||||||||||||||||GRADlUAtTE STUD)Y |p||||||i||1|

PRFDOCTORAI. ASSIS'FANTSHIPS

xcelleit oipportinirities aire vislulahle for grid-

i1itic studeitus to puirsuLe Ph.D in contemporari

itieas of Biological Scienices. Stiplerids are asail

aihle till to $'1S5()() for 9 months. till t(o l80( addi-tiotial fur tlic stinmrer. For detitils write toI)r. C. P. S-word. Chairman. ILife Sciences De-partment, Indiana State U nisersity. Terre Haute.Indiana 47809.

tl\phlic.tiolts are iivstied for Ic ii sLnirner posi-tiltS aIS jtlllior itivestigators to pIlrticipaite ill at.

N SF-spotisored rese,arch prograrm in EXPERI-NIENI AL MARINE BOTANY scltedtiled front

4 J Ltie tI Septeniter 1973 at the Marine Bio-lo0iual Lo/ruoiaori, Wood.t Hotle, Mal.st. 0)254.1 idC CLtc ot rescarchl experict'cc equit aldent toisilUdents ini gridtliate and postdoctcral positiotnsIii hiology or hiochfemistrs is rcqLiested. l'rojectiof Isve settiir inivestigitors in tiits progranl inclitledil_.il stidIcs of photorcdLIctiolt carhohydraitc arittSUlfate metabolism, biocliemistry of fertilizatiotn.aird clhloroplast developiicnt arid systeimatics otcc rtiain red algae, ravel atid per diemil expeniseseillie petrovided. Applicattion formils max hc (i-

tained from MBL (above adidress). Serid completediorms itlh refcrenices to lDr. F. ILoewus, lDepart-ment of Biology, State IJniversitv of New York-at Buffalo, Buffalo, N.Y. 14214 in trime to re.aciI(lti 131lta;1' acldi-ess b.efore 12 April 1973.

POSTDOCTORAL TEACHING IN1TERNSHIPtSIN BIOCHEMISTRY. Tsso fellowships are avuil-

aihlC aIS of Jcily 1973 for a postdoctoral teachillniritcrnslitp protgram desigtcd ltor recent gradtiatesin biochemistry tci dcselop proficiertcy in teachingContucutrrenrt research activities will be enicouiraged.FEr iiiformntioitl, write tr Dr. T. NI. I)elin, De-puartment of Biological Chemistry, liahnemannNiedical College, 230 North Broad Street. Phila-delphia, Pennsylsania 19102.

PREDOCTORAL FELLOWSHIP

I aldinrig to Ph.D). itt Expcrinicltal llathiologsI'Ivsiloiogic atid toxiiccliotgic effects of thec ciii-bUustiori of polynier flame retardanits arid relatednii tcrials. Stiptrid $55(i). W rite tt J. I. estoin.NI.D., Disision of Envsironmental and lForensicPathology, U lnisersitv of lah NMedical Center.50 No4rth Medical l)rive, Salt Lake City. U*tatt84112.

UNIVERSITE DE NMONTREAIInstitute of Experimental Medicine and SurgeryuFise felltwsships asailable for NI Sc. or PI .D

candidates to work on correlations between stress.erdotrinres and hepatic fminctions One year. rc-new ahle. Knowledge of French desirahle bLut titi

indispensahble. Forward application with C uirrc-LiILIII vitaie to Dr. Hans Selye. Institut de Nled-

ecine et de Chirtigie Experimentales, U!niversttede Niontreal, P.O. Box 6128. Montreal, P'(.Q..Canada.

REQUTEST FOR PROPOSAL |

It is the intcintioti of thec Cartinogcricsis Areaotf thie Nl ational Catricer InstitLute to advertisette asailability of two Request for Proposals ci-

tithed 'Identitication of Human Populatuins itRisk)Dtc to Expostire to N'-Nitroso (Comp)tICids"(requLsSt mtUst reference RFP No. NCI-E-C-73-24)mnd "Development and Application of Methods

flreN-Nitroso, Compouinds and Their PrcCtirsorsin thie itsrnironnitent' (rcqUest rtILlst rctlc-eliccNo. NCI -E-C-73-26).

Iriduvidtials representiiig research organiztionisus ho sit to receive copies of this reqtiest forproposal when it becomes availatble aire invitedlto submit their names to) the folloss ing atlcdresstrior tu 3 April 1973:

Nlr. Dennis J. DoughertyContract Specialist

Research Contracts BranchNational Cancer Institute

National Institutes of HealthLandow Building, Room C-425-D

Bethesda, Maryland 20014.

i|I||||||||||||I|I||||||||||SUMMER PROG RA M1 |||I|||I||||||||1lll11111liU NIOR ANI1 ADULI LCOLOGt- .SEM.IN AR

Explore natuiral history intl Indian irts in thtSierra and Great Basin. Ens ironment classes in

motlnitain. desert, Antelope Refuge, 'Fahoc. Yo-

semte. and Forest Research Reserse. Strong riding,swimming, crafts. Challenge to alert bots and

girls, Il0 to 14. Five-week sessiolos, 3 J tuls through6 ALIgLsit, 1973. Multiracial.

Also 2-week adult progratni. Writc for details.

Dr. & NMrs. Richard Gordon Miller, 6205

Franktown Road, Carson City, Nesada 897t01.Phones: 702-882-6361 or 882-1728.

1268

BioOrganicCHEMIST!Biochemist

PharmacologistWe seek a Ph D. with experience inchronic toxicity testing to providechemical! biological interface for alarge information retrieval system;shoild have potential to developnew carcinogeric assay methods.The successful candidate must beable to commLinicate effectivelyabout organic chemical structureand nomenclature; interpret chronictoxicity testing experiments andcorrelate results. Familiarity withlarge compuiter systems desirable.SRI is an independent contract re-search organization performing re-search in a variety of fields. Excel-lent benefits are available. We arean equjal opportunity employer.Please send r6sum6 with salary his-tory to Ms. Harriet B. Wherry, Per-sonnel Coordinator.

\ STANFORDRESEARCH

xLg > I NSTITUTE333 Ravenswood Ave.Menlo Park CA 94025

I

SCIENCE, VOL. 179