8
J. T. Baker liquid scin- tilliation products ar( Lsei lesteel h)V liquIid mcnlfillation spectrometry. Lot-to-lot uniformity is dle- ter,ttineid bs calibratior0 at.aMnist N3BS rdI iochemiiical starclda r ds. Key 1/soveintl i liqxuid scin- tillairn,Mri gale incl/de. 1,4-Dioxane and Toluene Al, ( avalildable are iOIpOI- tcal it (iL C SU Ii als: 2,5-Diphenyloxazole (PPO) 4,4'-Diphenylstilbene (DPS) 2-(1 -Naphthyl)- 5-phenyloxazole (o-NPO) 2,2'-p-Phenylene- bis(5-phenyloxazole) (POPOP) p-Terphenyl (p-TP) or these prodicl I and olin r th n 5,Ih i ,((1(1 ol er henircal'ls see our nies CXa t 11lo,(( E Ar]o complete gLricle tc) riiate- rials i(or critical lablortator\ It v d H a t hnve cp s C It d rie( ae -i one t I I C o J. -T- Baker Clher-ilcal Co. --- Red School Lane C-0 PhilliN8sburge N.Jerco)rd -J.T. Ba Circle NJo. 84 on Readers' Service Ccard I 0 I Identification of Systems. Daniel (fraupe. Van Nostrand Reinhold, New York. 1972 xii. 276 pp., ilIS. S14.95. 1 lie Illusioni of Equality NI urir as Nil ncr-. .l1. Josses B-Biss. Sar Francisco, 19727 xv- 172 ppr 8 S8' Circle No. 81 on Reoders' Service Card I BOOKS RECEIVED Philadelphia. 1972. xx, 146 pp., Ibius. $8. lc-nioirs ()t the Arrer cain Philosophical Societv " (f, 92. General Zoology Fracs 1 StorCr. Rooer-t C Stehbins, Robert 1 Usinrner, and J ames \A N bNvAkkn. McGi- ais-Hill, New York es.d 1972 xii. 91()1 pp.. ls I ().9 s Geology of Soils. heir EVol1tion. C Is- sification. and Uses. Chbarles B HLnt F reenian San Fr incisco, 1972. xii. 344 pp, lis. S]12 1) A Sciries of Books in Geologs. Gly colipids, Glycoproteins, and Muco- pol) saccharides of the Nervous System. Proceedings of A sy rnposirni Milan, July 1971. Vittorio Zambotti, Gurido Tetta- manti, a1nd Marlagrazia .Arrigoni, Eds. PlenuLm. Ne w York, 1972. xii, 334 pp., illIs 517.50. Advances in Experimental Nledicrne and Biolos , v ol. 2 5. Good Schools. H. P. Schoenheimer. Be- hasloral PuLblications. New York. 1972. 128 pp. Cloth. $8.95; paper, $4.95. Grow th Centers in Regional Economic Development. A confer-ence. AuLstin. Tex., Nov. 1969. Niles N. Hansen, Ed. Free Press. Newk York. Collier-NIMacmillan, ILondon. 1972. xv i. 298 pp.- ilS. S 12.95. Growth, Nutrition, and NMetabolism of Cells in Culture Vol. 1. George H. Roth- blat and Vir,enl J. Cristof-llo, Fds. ACa- demic Press, Ne York. 19'' xis,. 472 PP.- illtis. S24 A G,uide to Beliav ioral Analy sis and rherapy. Roehrt Punl I hermnan. Per- garmon, Ne\ \' oi . 1kl2. xis 344 p p ills Clorb. $9 .5. p.lr'CI Sn O Per- .imu) ( iicrler 1 Ps hClos(zox 8crIics. Handbook of Chlorination. For Potable W,ater, Wastew ater. Coolino Water. In- d(rstrial Processes, arnd Sss imming Pools. Ceo. Cliffordl White. \`an Nostr.rnd Rein- hold, New\ York, 19?2. k iii. 744 pp illuS. $37.50. High-ELiiergy Electromi.agnetic Processes in C'ondensed Media. Ni I '[e-M \ik,icliin. W ein%-lntecrsaericn Nes '1 or-k, 1972. x 'Ix r.. il, S 2A 7.5-. liitzeli- ie rl1 458 Pp-Li s7~ I irer aiereiris oni Pb s .ahlc arid i oAnotrisn No. 29 Hillslope F- orm and Process. N .A (',r s ,n iid I. .1. Hir-kbs. C rinibir idgc CLi usersits nc1-ss Ncwn \ irk h1')7 siii. 47h ;p. illis. S1i. 90 ( iCI ror itdL (CiO gr.iphKald Stluides. No's Hrrmian Factors in HigIhva rFraffli Safeht, Re- e:rch. .1 W. For-bsc1. I 1. W 5'iles Inter iereNess Yo or. 1k I7 \\0Ixx 4210 F ictors Huiniani Figuire D)rasi ing-s iii Adoles- ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-. .in Mtirshi SoricnbAli. k -Iin- ncr NIMaicl. N'ss * Bu tItetnr or trhs. ILorndoii 172'. x. S2 pp. ililus. 9sX5. The Hujimian Senises. iink N (Jeldird W rles Ness \ rrr k el 'I2 xis 5- pp.. '11LIS, S]2-50 L PHOTOMULTIPLIERS Now available from EMI-a range of high gain, low dark current photomultipliers with windows and cathodes suitable for use in the ultra-violet region. Available window materials in- clude: quartz, sapphire, magne- sium fluoride, and calcium fluo- ride. Cathode materials include: cesium telluride, rubidium tellu- ride, cesium iodide, potassium bromide, and copper chloride. For many applications, these tubes are superior to the method of using wavelength shifters, and have the further advantage of being solar blind (Insensitive to visible light). In general be- cause of their inherently low dark current, they will not re- quire cooling. A special housing type E-15 is available for cou- pling the detector to a vacuum system. Detatile(d S)ecificatiofns iire available from: GENCOM DIVISION Emit rorcs I?Ic. 8Q.EXPRESS ST., PLAINVIEW, N.Y. 11803 TELEPHONE (516) 433-5900

PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

  • Upload
    others

  • View
    0

  • Download
    0

Embed Size (px)

Citation preview

Page 1: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

J. T. Baker liquid scin-tilliation products ar(Lsei lesteel h)V liquIid

mcnlfillation spectrometry.Lot-to-lot uniformity is dle-ter,ttineid bs calibratior0at.aMnist N3BS rdI iochemiiicalstarclda r ds.

Key 1/soveintl i liqxuid scin-tillairn,Mri gale incl/de.1,4-Dioxane and Toluene

Al, ( avalildable are iOIpOI-tcal it (iL CSU Ii als:2,5-Diphenyloxazole (PPO)4,4'-Diphenylstilbene (DPS)

2-(1 -Naphthyl)-5-phenyloxazole (o-NPO)

2,2'-p-Phenylene-bis(5-phenyloxazole)

(POPOP)p-Terphenyl (p-TP)

or these prodicl I andolin r th n5,Ihi ,((1(1 ol erhenircal'ls see our nies

CXa t11lo,(( E Ar]ocomplete gLricle tc) riiate-rials i(or critical lablortator\

It v dH a thnve cpsCIt d rie( ae -i onet I I C o

J. -T- Baker Clher-ilcal Co.--- Red School Lane C-0PhilliN8sburge N.Jerco)rd

-J.T.Ba

Circle NJo. 84 on Readers' Service Ccard

I

0

I

Identification of Systems. Daniel(fraupe. Van Nostrand Reinhold, NewYork. 1972 xii. 276 pp., ilIS. S14.95.

1 lie Illusioni of Equality NI urir as Nilncr-. .l1. Josses B-Biss. Sar Francisco, 19727xv- 172 ppr 8S8'

Circle No. 81 on Reoders' Service Card

I

BOOKS RECEIVED

Philadelphia. 1972. xx, 146 pp., Ibius. $8.lc-nioirs ()t the Arrer cain Philosophical

Societv " (f, 92.General Zoology Fracs 1 StorCr.

Rooer-t C Stehbins, Robert 1 Usinrner,and J ames \A NbNvAkkn. McGi- ais-Hill,New York es.d 1972 xii. 91()1 pp.. lsI ().9 s

Geology of Soils. heir EVol1tion. C Is-sification. and Uses. Chbarles B HLntFreenian San Fr incisco, 1972. xii. 344pp, lis. S]12 1) A Sciries of Books inGeologs.

Glycolipids, Glycoproteins, and Muco-pol) saccharides of the Nervous System.Proceedings of A sy rnposirni Milan, July1971. Vittorio Zambotti, Gurido Tetta-manti, a1nd Marlagrazia .Arrigoni, Eds.PlenuLm. New York, 1972. xii, 334 pp.,illIs 517.50. Advances in ExperimentalNledicrne and Biolos , v ol. 2 5.Good Schools. H. P. Schoenheimer. Be-

hasloral PuLblications. New York. 1972.128 pp. Cloth. $8.95; paper, $4.95.Grow th Centers in Regional Economic

Development. A confer-ence. AuLstin. Tex.,Nov. 1969. Niles N. Hansen, Ed. FreePress. Newk York. Collier-NIMacmillan,ILondon. 1972. xv i. 298 pp.- ilS. S 12.95.Growth, Nutrition, and NMetabolism of

Cells in Culture Vol. 1. George H. Roth-blat and Vir,enl J. Cristof-llo, Fds. ACa-demic Press, Ne York. 19'' xis,. 472PP.- illtis. S24A G,uide to Beliav ioral Analy sis and

rherapy. Roehrt Punl I hermnan. Per-garmon, Ne\ \' oi .1kl2. xis 344 ppills Clorb. $9 .5. p.lr'CI Sn O Per- .imu)( iicrler 1 Ps hClos(zox 8crIics.Handbook of Chlorination. For Potable

W,ater, Wastew ater. Coolino Water. In-d(rstrial Processes, arnd Sss imming Pools.Ceo. Cliffordl White. \`an Nostr.rnd Rein-hold, New\ York, 19?2. k iii. 744 pp illuS.$37.50.

High-ELiiergy Electromi.agnetic Processesin C'ondensed Media. Ni I '[e-M\ik,icliin.W ein%-lntecrsaericn Nes '1 or-k, 1972. x

'Ixr.. il, S 2A 7.5-. liitzeli- ie rl1458 Pp-Li s7~I irer aiereirisoni Pb s.ahlcarid ioAnotrisn No. 29

Hillslope F-orm and Process. N .A(',r s ,n iid I. .1. Hir-kbs. C rinibir idgcCLiusersits nc1-ss Ncwn \ irkh1')7 siii.47h ;p. illis. S1i.90 (iCIror itdL (CiOgr.iphKald Stluides. No's

Hrrmian Factors in HigIhva rFraffliSafeht, Re- e:rch. .1 W. For-bsc1. I 1. W5'ilesInter iereNess Yoor.1kI7\\0Ixx 4210

F ictorsHuiniani Figuire D)rasi ing-s iii Adoles-

ceice. NM llre S. SchildkF(il. 1. R1irrldShenker-. .in Mtirshi SoricnbAli.k -Iin-ncr NIMaicl. N'ss * ButItetnror trhs.ILorndoii 172'. x. S2 pp. ililus. 9sX5.The Hujimian Senises. iink N (Jeldird

W rles Ness \ rrr k el 'I2 xis 5-

pp.. '11LIS, S]2-50

L

PHOTOMULTIPLIERSNow available from EMI-arange of high gain, low darkcurrent photomultipliers withwindows and cathodes suitablefor use in the ultra-violet region.Available window materials in-clude: quartz, sapphire, magne-sium fluoride, and calcium fluo-ride. Cathode materials include:cesium telluride, rubidium tellu-ride, cesium iodide, potassiumbromide, and copper chloride.For many applications, thesetubes are superior to the methodof using wavelength shifters,and have the further advantageof being solar blind (Insensitiveto visible light). In general be-cause of their inherently lowdark current, they will not re-quire cooling. A special housingtype E-15 is available for cou-pling the detector to a vacuumsystem.

Detatile(d S)ecificatiofns iireavailable from:

GENCOM DIVISIONEmit rorcs I?Ic.

8Q.EXPRESS ST., PLAINVIEW, N.Y. 11803TELEPHONE (516) 433-5900

Page 2: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

Immunobiological and ImmunochemicalStudies of the Oyster Crassostrea Virgin-ica. A doctoral thesis, University of Ala-bama, 1970. Ronald Terry Acton. MSSInformation Corp., New York, 1972. x,134 pp., illus. $17.

In the Beginning. An Introduction toArchaeology. Brian M. Fagan. LittleBrown, Boston, 1972. xviii, 356 pp., illus.$9.50.

Inorganic Chemistry of Vitamin B12.J. M. Pratt. Academic Press, New York,1972. x, 348 pp., illus. $18.75.

International Bibliography of the SocialSciences. Bibliographie Internationale desSciences Sociales. 1970 International Bib-liography of Social and Cultural Anthro-pology. Vol. 16. International Committeefor Social Sciences Documentation. Tavis-tock, London; Aldine, Chicago, 1972. lx.292 pp. $15.

International Symposium on Sulphur InAgriculture. Symposium International surle Soufre en Agriculture. Versailles, Dec.1970. Institut National de la RechercheAgronomique, Versailles, 1972. x, 412 pp.,illus. Paper, 50 F. I.N.R.A. Publication72-1.

International Virology 2. Proceedingsof a congress, Budapest, June 1971.Joseph L. Melnick, Ed. Karger, Basel,1972 (U.S. distributor, Phiebig, WhitePlains, N.Y.). xii, 344 pp., illus. $26.50.

Interplanetary Flight and Communica-tion. N. A. Rynin. Translated from theRussian edition. Published for the Na-tional Aeronautics and Space Administra-tion and the National Science Foundationby the Israel Program for Scientific Trans-lations, Jerusalem, 1971 (available fromNational Technical Information Service,Springfield, Va.). Vol. 1, No. 3, RadiantEnergy. Science Fiction and ScientificProjects. vi, 134 pp., illus. N72-18827.Vol. 2, No. 4, Rockets. vi, 208 pp., illus.N72-22885. Vol. 2, No. 6, Superaviationand Superartillery. iv, 216 pp., illus. N72-22884. Vol. 3, No. 7, K. E. Tsiolkovskii.Life, Writings, and Rockets. viii, 106 pp.,illus. N72-20957. Vol. 3, No. 8, Theoryof Space Flight. vi, 340 pp., illus. N72-22809. Vol. 3, No. 9, Astronavigation.Theory, Annals, Bibliography. iv, 236 pp.,illus. N72-22645. Each vol., paper, $3;microfiche, $.95.An Introduction to Acoustical Holog-

raphy. B. P. Hildebrand and B. B. Bren-den. Plenum, New York, 1972. xii, 224pp., illus. $14.50.

Introduction to Chemistry. Joseph C.Muhler, Charles S. Rohrer, and ErnestE. Campaigne. Xerox, Lexington, Mass.,1972. xvi, 534 pp., illus. Paper, $8.50.Introduction to Glass Science. Proceed-

ings of a symposium, Alfred, N.Y., June1970. L. D. Pye, H. J. Stevens, and W. C.LaCourse, Eds. Plenum, New York, 1972.x, 722 pp., illus. $32.An Introduction to Industrial Organic

Chemistry. Peter Wiseman. Wiley-Inter-science, New York, 1972. x, 336 pp., illus.$12.95.An Introduction to Modern Optics.

Ajoy K. Ghatak. McGraw-Hill, NewYork, 1972. xx, 368 pp. + plates. $9.95.

Introduction to PL/I Programming forLibrary and Information Science. ThomasH. Mott, Jr., Susan Artandi, and Leny

Uissue-cufturemicroscop ,II

A

25 AUGUST 1972 727

Page 3: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

The new EU-801E Mini-Computer Interface allows owners of any PDP-8family computer (with positive I/0 bus) to take full advantage of theirmini's capabilities.. .by allowing direct input of measurement data andoutput of processed data and control information. The 801E is ideal forinterfacing a variety of digital instruments.. .designing complex dedi-,ated interfaces...or just learning about interfacing. All connectionpoints necessary for a functioning interface are readily available outsidethe computer: all signals required for any given data transfer operationare legibly and logically presented on the top of a plug-in card in the801E ADD unit. Connection points on the card top include 12-bit digitalinputs and outputs (Accumulator In, Accumulator Out and Buffered Mem-ory Bus), three control lines, five timing lines and two status lines. Andbecause the 801E is a patch system using positive-contact connectorsand ordinary hook-up wire, there is no soldering. Simple data transfercircuits can be patched and tested in a few minutes. Signal modifica-tion and device control circuits can be quickly developed and refined.For detailed information on the new Heath/Schlumberger EU-801E Mini-Computer Interface, send coupon below for free brochure...and learnhow you can turn your PDP-8 into a maxi-mini.EU-801E System, 42 lbs ........................$1250.00*

I HEATH pR

; Heath/Schlumberger Scientific InstrumentsI Department 544.1q4. Ii Benton Harbor, Michigan 49022 II I'm convinced and need a maxi-mini now. Enclosed is $

plus shipping for EU-801E(s).I'm interested but not convinced. Please send EU-801E brochure.

, a Please send 1972 Instrumentation Catalog.* Name

Title* Company/institution I* Address

City State Zip-*Mail Order price; F.O.B. Benton Harbor, Michigan EK-329 I

-----------------------------------------.J

728 Circle No. 60 on Readers' Service Card

Forma'supright freezer makesdownright good sense

I

MCI

Particularly when youconsider what you getfor your money. A 13cubic foot capacity.Four separate interiorcompartments, separa-ted by solid shelves.Temperatures down to-730 C in a 290 Cworking ambient. Re-frigeration in all in-terior walls. Andfoamed-in-place ure-thane insulation.

Look at quality. Lookat size. Look at price.Then decide who's thebest buy.Forma's upright

freezer. Downright sen-sible.

Forma ScientificpHlrlX 541 * t.^AR eTTA 0FI:-} 4S75'' * AREA CODE 614 373-4761

Circle No. 92 on Readers' Service CardSCIENCE, VOL. 177

Kiett SummersonPhotoelectric Colorimeter

Test TubeModel

KLIETTCOLONY MARKER and TALLY

This instrument takesthe drudgery and er-ror out of the count-ing of bacterial colnies.

K /cit \IANUFACTURING CO., INC.,179 East 87th Street. New York. 28, N.Y.

Cirde No. 91 on Readers' ServI Cord

Page 4: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

-$0 0 -

I2)O'But nobodyclips coupons;

You can't find a scissors.IYour secretary is out tolunch. And besides, couponsare a lot of trouble. Too bad.Our brochure (what you getfor the coupon) proves hoWan automatic watering sys-tem for animals can cut 30%off animal care costs in mostfacilities. For the typical5000 cage lab that comes to

il about $20,000. Every year.And because these savingsare proportional, Hatrdcequipment offers substantial-cost reductions to any: fa-cility, large or smalL.Our brochure also clearly ex-plains why automatic water-ing is actually better for youranimals. And as proof; we'll'llist more than 500 labs acrossthe country where it is work-ing and working well. Quitea lot for the priceof a stamp.

Please """send me

broChUre.

Name

Title

Firm

Street

City

State Zip

Animal

dMsson of ieLstor coXporat

1208 Omni DriveCincinnati, Ohio 45245

Monique Watteau. M.I.T. Press, Cam-bridge, Mass., 1972. xiv, 306 pp. Paper,$2.95. Reprint of the 1965 edition.

Optical and Acoustical Holography.Proceedings of a NATO Advanced StudyInstitute, Milan, May 1971. Ezio Cama-tini, Ed. Plenum, New York, 1972. xii,436 pp., illus. $26.

Organometallic Reactions. Vol. 3.Ernest I. Becker and Minoru Tsutsui, Eds.Wiley-Interscience, New York, 1972. xii,434 pp., illus. $26.

Perception in Everyday Life. S. HowardBartley. Harper and Row, New York,1972. x, 326 pp., illus. Paper, $3.95.The Periodic Table of the Elements.

R. J. Puddephatt. Oxford University Press,New York, 1972. x, 84 pp., illus. Paper,$1.95. Oxford Chemistry Series.

Pesticide Chemistry. Proceedings of acongress, Israel, Feb. 1971. A. S. Tahori,Ed. Gordon and Breach, New York, 1972.Vol. 2, Insecticide Resistance, Synergism,Enzyme Induction. viii, 302 pp., illus. Vol.3, Chemcal Releasers in Insects. viii, 228pp., illus. Each vol., $12.50.

Physics in the Twentieth Century. Se-lected Essays. Victor F. Weisskopf. M.I.T.Press, Cambridge, Mass., 1972. xvi, 368pp., illus. $7.95.The Physics of Electronic and Atomic

Collisions. A conference, Amsterdam,July 1971. T. R. Govers and F. J. DeHeer, Eds. North-Holland, Amsterdam;Elsevier, New York, 1972. xii, 496 pp.,illus. $39.50.

Physics of Rare Earth Solids. K. N. R.Taylor and M. I. Darby. Chapman andHall, London, 1972 (U.S. distributor,Barnes and Noble, New York). xii, 308pp., illus. $23.75.The Physiology of Lactation. A. T.

Cowie and J. S. Tindal. Williams and Wil-kins, Baltimore, 1971. viii, 392 pp., illus.$23.75. Monographs of the PhysiologicalSociety, No. 22.

Plastics History U.S.A. J. Harry Du-Bois. Cahners, Boston, 1972. xiv, 448 pp.,illus. $15.PL/C. A Processor for PL/l. R. Clay

Sprowls. Canfield, San Francisco, 1972.viii, 248 pp., illus. Paper, $5.95.

Politics, Policy, and Natural Resources.Dennis L. Thompson, Ed. Free Press, NewYork; Collier-Macmillan, London, 1972.viii, 452 pp., illus. $12.95.

Proceedings of the Amsterdam Inter-national Conference on Elementary Par-ticles. June 1971. A. G. Tenner and M.J. G. Veltman, Eds. North-Holland,Amsterdam; Elsevier, New York, 1972.viii, 472 pp., illus. $39.50.

Product Planning. A. Edward Spitz, Ed.Auerbach, Princeton, N.J., 1972. xvi, 424pp., illus. Cloth, $11.95; paper, $7.

Psychological Perspectives. FamilyPlanning in Korea. Bom Mo Chung,James A. Palmore, Sang Joo Lee, andSung Jin Lee with the assistance of HoonKoo Lee, Sang Chin Choi, I1 Je Sung,Jong Seung Lee, Sung Soo Park, and AeDoh Cho. Korean Institute for Researchin the Behavioral Science, Seoul, Korea,1972. 532 pp. $10.The Psychology of Death. Robert Kas-

tenbaum and Ruth Aisenberg. Springer,New York, 1972. xii, 498 pp. $11.95.The Psychology of Humor. Theoretical

Perspectives and Empirical Issues. JeffreyH. Goldstein and Paul E. McGhee, Eds.Academic Press, New York, 1972. xxii,294 pp., illus. $11.95.

Psychosomatic Medicine in Obstetricsand Gynaecology. Proceedings of a sym-posium, London, Mar. 1971. NormanMorris, Ed. Karger, Basel, 1972 (U.S.distributor, Phiebig, White Plains, N.Y.).xvi, 638 pp., illus. $42.

Pulmonary Emphysema and Proteolysls.Proceedings of a symposium, Duarte,Calif., Jan. 1971. Charles Mittman, Ed.xxviii, 562 pp., illus. $21.45. City of HopeSymposium Series.PVC Technology. W. S. Penn. W. V.

Titow and B. J. Lanham, Eds. Wiley-In-terscience, New York, ed. 3, 1972. xii, 546pp., illus. $39.95.

Racial Attitudes in America. Analysesand Findings of Social Psychology. JohnC. Brigham and Theodore A. Weissbach,Eds. Harper and Row, New York, 1972.xiv, 402 pp., illus. Paper, $6.95.

Radiopharmaceuticals from Generator-Produced Radionuclides. Proceedings of apanel, Vienna, May 1970. InternationalAtomic Energy Agency, Vienna, 1971(U.S. distributor, Unipub, New York). viii,206 pp., illus. Paper, $6. Panel Proceed-ings Series.

Readings in Living Systems. Julius S.Greenstein. Canfield, San Francisco, 1972.x, 190 pp., illus. Paper, $3.50.

Recent Trends in Social LearningTheory. Proceedings of a symposium,Mar. 1969. Ross D. Parke, Ed. AcademicPress, New York, 1972. x, 114 pp., illus.$7.95.

Research and Clinical Studies in Head-ache. An International Review, Vol. 3.A symposium, Florence, Italy, May 1970.A. P. Friedman, Ed. Karger, Basel, 1972(U.S. distributor, Phiebig, White Plains,N.Y.). x, 378 pp., illus. $39.20.

Science and Society, 1600-1900. PeterMathias, Ed. Cambridge University Press,New York, 1972. viii, 166 pp. + plates.$10.50.

Science, Psychology, and Communica-tion. Essays Honoring William Stephen-son. Steven R. Brown and Donald J.Brenner, Eds. Teachers College Press,New York, 1972. xxviii, 464 pp., illus.$12.50. Foresight Books in Psychology.The Search for Organic Reaction Path-

ways. Peter Sykes. Longman, London,1972. xii, 248 pp., illus. Paper, £ 1.90.Secondary Analysis of Sample Surveys.

Principles, Procedures, and Potentialities.Herbert H. Hyman. Wiley, New York,1972. xiv, 348 pp., illus. $11.95.Seed Biology. Vol. 1, Importance, De-

velopment, and Germination. T. T. Koz-lowski, Ed. Academic Press, New York,1972. xiv, 416 pp., illus. $26.40. Physiol-ogical Ecology.

Selected Measurement Methods forPlutonium and Uranium in the NuclearFuel Cycle. Clement J. Rodden, Ed. U.S.Atomic Energy Commission Office of In-formation Services, Oak Ridge, Tenn., ed.2, 1972 (available as TID-7029 (2nd. ed.)from National Technical InformationService, Springfield, Va.). xvi, 440 pp.,illus. $6.

Selected Papers of Cecil Frank Powell.E. H. S. Burhop, W. 0. Lock, and M. G.K. Menon. Eds. North-Holland, Amster-

SCIENCE, VOL. 177

0 JoCircet N 088ona Raders'i Service,CaordI: - rE

__ _ _ _i_I_ _ _ _I_---; I-

Page 5: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

dam; Elsevier, New York. 1972. xiv, 456pp., illuLs. $27.50.

Setting National Priorities. The 1973BuLdget. Brookings Institution, Washington,D.C., 1972. xxii, 468 pp. Paper, $3.50.

Socialization and Social Class. AlanC. Kerckhoff. Prentice-Hall, EnglewoodCliffs, N.J., 1972. vi, 170 pp. $5.95.

Solving Problems in Advanced Calculus,1. R. P. Gillespie. Oliver and Boyd, Edin-burgh, 1972. viii, 156 pp., illus. Paper,£ 1.50. Solving Problems in Mathematics.No. 8.Some Common Flowering Plants of

Uganda. E. M. Lind and A. C. Tallantire.Oxford University Press, New York, ed.2, 1972. vi, 260 pp.. illus. Paper, $4.50.

Staged Cascades in Chemical Process-ing. P. L. Thibaut Brain. Prentice-HallEnglewood Cliffs, N.J., 1972. xii, 276 pp.,ilL's. $14.50. Prentice-Hall InternationalSeries in the Physical and Chemical Engi-neering Sciences.

Statistical Computer Performance Eval-uation. Proceedings of a conference,Providence, R.I., Nov. 1971. Walter Frei-berger, Ulf Grenander, Barry H. Margo-lin, and Rhett F. Tsao, Eds. AcademicPress, New York, 1972. xviii, 514 pp..illus. $15.

Die Strahlengefahrdung des Menschenin der gegenwartigen Zilvilisation. GeorgeFuchs. Akademie-Verlag, Berlin. 1971.512 pp., illus. 58 DM.The Structure and Function of Nervous

Tissue. Vol. 5. StructuLre III and Physiol-ogy Ill. GeofTrey H. Bourne, Ed. Academ-ic Press, New York, 1972. xvi, 584 pp..illIts. $32.

Surface and Defect Properties of Solids.Vol. 1. A Review of the Literature Pub-lished between Jan. 1970 and Apr. 1971.M. W. Roberts and J. NI. Thomas, seniorreporters. Chemicail Society, London,1972. viii, 264 pp., illuLs. £-6. A Special-ist Periodical Report.The Teenager in a Drugged Society. A

Symptom of Crisis. Celia Spalter Deschin.Rosen, New York, 1972. 182 pp. $3.99.

Telling Tongues. Language Policy inMexico. Colony to Nation. Shirley BriceHeath. Teachers College Press, New York,1972. xx, 300 pp., illus. $10. Publicationsof the Center for EduLcation in LatinAmerica, InstituLte of International Studies.

That NMost Distressful Nation. TheTarming of the American Irish. AndrewNI. Greeley. Quiadrangle, Chicago, 1972.xxx, 282 pp., illus. $7.95.Theory of Science. Attempt at a De-

tailed and in the Main Novel Expositionof Logic with Constant Attention to Ear-lier Authors. Bernard Bolzano. Edited andtranslated from the German edition(SuLlzbach, 1837) by Rolf George. Univer-sity of California Press, Berkeley, 1972.xlviii, 400 pp., illus. $16.

U.S. Foreign Policy and Peru. DanielA. Sharp, Ed. Published for the Instituteof Latin American Studies by the Uni-versity of Texas, Austin, 1972. xxvi, 486pp. $10. Special Publication of the Insti-tuLte of Liatin American StuLdies.

Vacationscape. Designing Tourist Re-gions. Clare A. Gunn. University of TexasBureau of Business Research, Austin,1972. x, 238 pp., illus. Paper, $8. StuLdiesin Tourism-Recreation. No. 1.

25 AUGUST 1972

we ship everywhereYou just specify weights and quantity, andyou can choose from any of our manydifferent strains of CAMM-Hartley-derivedor English short hair guinea pigsIf your order comes in early in the morningit can be on its way that same dayBy company truck or by direct routeAir Express for long distances

And CAMM guinea pigs will arrive inhealthy vigorous condition,free from respiratory ailments

Pick up the phone and see for yourselfAsk us for our new price list

cammmeets your exact requirements in

0 0guilnea pISGami Research Institute, Inc.414 Black Oak Ridge RoadWayne, New Jersey 07470 Tel: 201 / 694-0703

Circle No. 83 on Reoder's Service Card

Revco offersTOTALULT Freezer Efficiencywith InventoryContmol Systems.

For years a pioneer in ULTra-Low® temper-ature freezers, Revco offers an Inventory ControlSystem that is adaptable to your needs. Revcocan provide TOTAL freezer efficiency in sizes from1/2 to 25 cubic feet, including popular 6.5, 9, 12and 17 cubic-foot sizes, chest and upright.

REVCO. ~INC. f ,1148 Memorial DriveWest Columbia, S.C. 29169Tel. (803) 796-1700

The world's leader in ULTra-low®3 temperature equipment.

Circle No. 82 on Readers' Service Card731

Page 6: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

Medicine and BiologySalary to $21,471National Health and Welfare

Ottawa, OntarioTHIS COMPETITION IS OPEN TO BOTH

MEN AND WOMENThe Heaith Protection Branch's Division of Medicine andPhiarmacology has openings for Ph.D. scientists to review,evaluate and render recommendations on research results asto safety and efficacy in drug submissions (applications) forhumans filed by pharmaceutical manufacturers. Vacanciesexist in sections dealing with internal medicine and medicalsub-specialt es obctetrics and gynecology (endocrinology.radiopharmaceuticals, oncology, neu ropsychopharmacology,antibiotics, vaccines, anesthetics, etc. Applicants should bedoctorate graduates in an appropriate scientific or medicaldiscipline, with experience in one or more of the followingfields: Pharmacology, toxicology, drLug evaluation, researchmethods, statistics, immunology, virology, and/or bacteriology.For some positions, candidates must be qualified in theknowledge and use of both the French and English languages.Scientists can expect to have about 200% of their time freefor nonreviewing, goal oriented, extra curricular activities suchas participation in reseach, teaching, etc, Academic affiliationin Ottawa, while not essential, is encouaged.Starting salaries are attractive, will relate to and be com-mensLurate with applicant's and experience and will reflectthe importance and responsibilities attached to the individualposi tion,

interested parties are urged to submit a detailed resume ofeclelcation and experience by September 30, 1972 to:

BIO-PHYSICAL SCIENCES PROGRAM,PUBLIC SERVICE COMMISSION OF CANADA,

TOWER "A" PLACE DE VILLE,OTTAWA, ONTARIO, KIA OM7

Reference nuimber 72-1555 must be quoted.

COLORADO SERUM COMPANY ....

providing the finest:

.Animal Blood ProductsTissue Culture Media

4 Normal Serums

* Plasma* Cells* Antisera

and other Diagnostic Reagent Products

send for catalog

since 1923

COLORADO SERUM COMPANY, Laboratories.4950 York St., Denver, Colorado 80216

U. S. Veterinary License 188Circle No. 93 on Readers' Service Card

SCIENC'E, VOL. 177-it

I I loll la] I I *I

Research

in the

Antarctic

Edited byLouis 0. Quam

The first single-volume report of the extensive researchconducted in the Antarctic since the International Geo-physical Year.700 pages, hundreds of illustrations and tables, a com-prehensive index. Full color wall map of Antarctica.Member's price (with check accompanying order): $19.95.Regular price: $24.95. Send orders to Department R2.

AMERICAN ASSOCIATION for theADVANCEMENT of SCIENCE1515 Massachusetts Avenue, N.W.Washington, D. C, 20005

BLOODBANK

MANAGEMENTA major West Coast medical products firm hasimmediate openings for management level per-sonnel who have strong blood banking admin-istrative and technical experience. The individuals we are seeking must be capable of work-rig independently in areas such as donor cen-ter (plasmapheresis) operations, immunizationscheduling, inspections, inventory control andfinancial forecasting. These growth orientedpositions offer an excellent starting salary plusan outstanding benefits package which includesstock purchase, profit sharing, free life insur-ance, group medical plan, paid sick leave andvacation. Please send resume with salary his-tory to:

Box 332, SCIENCE

An equal opportunity employer

Page 7: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

NEWS AND COMMENT

iConti,iiied froni page 684

search fellow, Carnegie Commission onHigher Education. . . David V. Ra-gone, dean, School of Engineering,Dartmouth College, to dean, College ofEngineering, University of Michigan.

RECENT DEATHS

Richard A. Bloomfield, 39; actingdean, Graduate School, University ofMissouri; 19 April.Robert W. Dickey, 79; professor

en3erittls of physics, Washington andLee University; 24 March.

Julius Fox, 57; associate clinical pro-fessor of dental surgery, Albert EinsteinCollege of Medicine; 5 May.

Harry Gold, 72; professor emeritusof clinical pharmacology, Cornell Uni-versity Medical College; 21 April.

Julius Halpern, 60; professor of phys-ics, University of Pennsylvania; 13 May.

Frederick V. Hunt, 67; professor ofphysics, Harvard University; 21 April.Edward C. Kendall, 86; visiting pro-

fessor of chemistry, Princeton Univer-sity; 4 May.

Aubrey E. Landry, 91; professoremeritus of mathematics, Catholic Uni-versity; 3 May.

Ernest L. Mackie, 79; professor emer-itus of mathematics, University of NorthCarolina; 18 April.

John N. McDonne!i, 62; former pres-ident, College of Pharmacy, ColumbiaUniversity; 11 April.

Sandor Rado, 82; retired presidentand dean, New York School of Psy-chiatry; 14 May.

Melvin C. Rigg, 76; former chair-man, philosophy and psychology de-partment, Wisconsin State University,Eau Claire; 15 March.

Wendell G. Scott, 66; professor ofclinical radiology, Washington Uni-versity School of Medicine; 4 May.

John Q. Stewart, 77; retired professorof astronomy, Princeton University;19 March.Joseph Stokes, Jr.. 76; professor

emeritus of pediatrics, University ofPennsylvania; 10 March.

Lloyd E. Swearingen, 75; professoremeritus of chemistry, University ofOklahoma; 9 March.

Laszlo Zechmeister. 82; professoremeritus of organic chemistry, Cali-fornia Institute of Technology; 28 Feb-ruary.

PersonnelPlacementI

||||||1141111POSMTONS WANTED I|lllljilllAnthropologist: Near Ph.D.; 4 years of teachingexperience. Academic specialties: kinship andsocial organization, evolution and culture chanle,theoretical anthropology, ethnlology of NorthAmerica. Research experience and interest inpsychology. Immediate availability in UnitedStates or foreign country. J. Vernon Shehan, 1572June Avenue, San Jose, California 95122. X

Biochemist Ph.D. 1962. Physical and chemicalproperties of carbohydrates and interacting en-zymes. Desires teaching and/or research position.Write 0. S. Fisher, Blackfoot, Idaho 83221. X

Electron Microscopy, technician with 1 year ofexperience in most phases of electron microscopywork. Box 334, SCIENCE. X

Ophthalmologist. Subspecialist in corneal diseasesand ocular microbiology and immunology. Direc-tor of large academic research group and clinicalservice with major grants and contracts. Consider-able experience with anti-infectines, anti-inflam-matories, and FDA procedure. Interested inproduct development and promotion internation-ally. Desires creative top management position.Call 319-337-4734. X

Ph.D. Nutritional Biochemistry, MassachusettsInstitute of Technology. 1970; D.M.D., Tufts,1964. Experience includes biostatistics, electronmicroprobe, SEM. A. J. Saffir, 1342 FieldfairCourt, Sunnyvale, California 94087. X

Ph.D. Pharmacology; physiology, microbiologyminors, medical backgrouLnd, experienced teacherseeks medical, biology, nonacademic position,available September. Box 335, SCIENCE. X

Pharmacology M.S., chemistry B.S.; 25, recentgradLtate. Lab experience in chemistry spectros-copy, physiology and pharmacology; adaptable.Desires industrial position. Box 336, SCIENCE.

x

Physicist Ph.D. 1972. Light scatterer. Diverseexperience in laser excited light scattering andflLorescence. Desires to apply background toenvironmentally or biologically related research.Available in September. Box 337, SCIENCE. X

IIIIIIIII"IIIIPosroNS OPEN 111!1!llllllll1llUNIVERSITY OF LOUISVILLE

COLLEGE OF ARTS AND SCIENCES

Applications are invited for the position of Dean,College of Arts and Sciences. Earned doctorate,college teaching, and faculty committee experiencereqliired. Administrative experience desirable. Ad-drcss all inquiries to Professor William G. Bos,Chairman, A & S Search Committee, Universityof Louisville, Louisville, Kentucky 40208. TheUniversity is a state-supported Urban Universityand is an Equal Opportunity Employer.

AGRICULTURAL BIOCHEMISTFaculty position with dual research title of

comparable rank in the Agricultural ExperimentStation. To teach chemistry and metabolism ofnticleic acids and develop research program inplant proteins. nucleic acids, or virus metabolismat the cellular and sub-cellular level. Minimumof 13 years of postdoctoral experience with pub-lication record demonstrating capacity for in-dependent productive research. Rank and salarywill be based on qualifications and experience.

Applications including curriculum vitae, namesof three referees, list of publications, and astatement of research interest should be sent toDr. Mitchell G. Vavich, Head, Department ofAgricultural Biochemistry, University of Arizona,Tucson, Arizona 85721.

An Equtal Opportunzitsy Employer

CELL BIOLOGIST, Ph.D.

To join a team effort to study mechanism ofchemical carcinogenesis for nonprofit medical re-search organization in New York City. Send cur-riculum vitae and salary reqtiirements to: Box SM447, 810 7th Ave., New York, N.Y. 10019.

25 AUGUST 1972

CardiopulmonaryPhysiology

Medical Devices Testand Evaluation

The lIT Research Institute haschallenging positions for experi-enced physicians and physiolo-gists to join a multi-disciplinaryresearch group whose primaryobjective is focused upon thetest and evaluation of cardiacand pulmonary assist devices.

The candidates we are seekingshould have a demonstratedcapabilIity in the application ofcardiovascular and pulmonaryphysiology to solving inter-disciplinary research problems.The physician sought shouldhave training in internal medi-cine and cardiology. Primaryinterests of all candidatesshould be one or more of thefollowing areas; cardiovascularphysiology, pulmonary physi-ology, artificial organs and as-sist devices. The candidatesshould have between 5 and 7years of experience with clini-cal and/or animal research andsurgery, including the use andunderstanding of medical in-strumentation.

The positions will entail the regsponsibility for the test andevaluation of artificial organs,circulatory and respiratory as-sist type devices. Included willbe the development of clinicalcriteria for meaningful evalua-tion procedures.

The lIT Research Institute islocated on the campus of theIllinois Institute of Technologyand Is an independent contractresearch organization servingindustry and government. Itsactivities encompass nearly allof the physical and biologicalsciences and their related tech-nologies. For prompt considera-tion of your interest, pleaseforward a detailed resume, in-cluding salary history, to Mr.Ronald C. Seipp, or call collect(312/225-9630, Ext. 4231).

UUEtIJ Research10 West 35th Street

Chicago, Illinois 60616

An Equal Opportunity Employer(M/F)

I0. 0

733

A

Page 8: PHOTOMULTIPLIERS - Science€¦ · W5'iles Inter iereNess Yoor.1kI7\\0Ixx 4210 F ictors Huiniani Figuire D)rasiing-s iii Adoles-ceice. NM llre S. SchildkF(il. 1. R1irrld Shenker-..in

* The National Institute of DentalResearch has established the

I National Caries Program to de- II velop measures and agents for I* markedly reducing the prevalence *

of tooth decay. A concerted ef-fort is now being made to spon-

I sor research to produce new II information toward this end. *

IImplementation of this program *requires the appointment of oneor two scientists, on a selective I

I basis, who: (1) have had signifi- I* cant experience at the postdoc- ** toral level in dental research or

related basic sciences, (2) haveI a genuine interest in being a II full-time science administrator, I* and (3) are willing to relocate to

the Washington, D.C. area.The development of enzymes

I and anti-metabolites to combat II caries-inducing bacteria is one* of the key research areas in the

National Caries Program. Ac-I cordingly, individuals with recent II experience in enzymology, im- I* munology, pharmacology, and/or

related disciplines are preferred.Project scientists in this pro-

* gram are responsible for devel- II opment, coordination, site-visit- ** ing and reporting of collaborative

research projects and contracts.* The beginning salaries for these II Civil Service appointments range I* up to $21,960. U. S. citizenship ** required.

Those interested in being con-I sidered are invited to submit II their resumes before October 1, ** 1972, including a covering letter

explaining their motivation to-| ward a career in science admin- I* istration as opposed to partici- I* pation in laboratory research. *

NATIONAL INSTITUTESOF HEALTH

National Institute ofDental Research

National Caries Program I

OWestwood Building, Room 549w 5333 Westbard Avenue

Bethesda, Maryland 20016* An Equal Opportunity Employer MIF

-------4- ---- -

734

POSITIONS OPN- POO-~ POSlTMONS ore ....N r~ PMONSEN-p------~-------

I NIH.I* Applicatons Are Invited

forAppointnent as

PROJECTI I

SCIENTISTIN THE

NATIONAL INSTITUTEOF DENTAL RESEARCH

Further general information and details of appli-cation procedures are available from the AetingAcademic Registrar, Monash University, Welling-ton Road, Clayton, Victoria 3168. Inquiries aboutthe department and research interests of thestaff from the Chairman, Professor R. H. Day.

Closing Date: 30 September 1972.The University reserves the right to make no

appointment or to appoint by invitation.

CELL PHYSIOLOGISTRecent Ph.D. for research in the intracellulartransport of small solutes and macromolecules.Will learn advanced biophysical techniques. Posi-tion requires initiative and technical proficiency.Send vitae and references to: Dr. S. B. Horowitz,Michiga Cancer Foundation, Detroit, Michigan48261

CRYOBIOLOGISTPh.D. with experience in cryobiology to superyise

-a cryobiology research program in blood cell andtissue cryopreservation. Additional information,contact Dr. R. E. Reed, ACOS, VA Hospital,2215 Fuller Road, Ann Arbor, Michigan 48105,313-769-7100 ext. 221.

DEPARTMENT HEADTissue Culture

Progessive biomedical research and productioncompany has immediate opening for an experi-enced individual to supervise all phases of tissueculture preparation in a production department.Require B.S. or M.S. degree in microbiology orchemistry with in-depth knowledge of tissue cul-ture and virology and 2 to 5 years' experiencenecessary. Prior supervisory experience would bean advantage. Excellent starting salary and com-pany benefits. Send resume in confidence to

Box 338, SCIENCE

UNIVERSITY OF OTAGODunedin, New Zealand

CHAIR OF HUMAN NUTRITIONApplications are invited from medical or sci-

ence graduates for the newly established Chairof Human Nutrition.

Professorial salaries are fixed at various pointswithin the range of $NZ11 ,698 per annum to$NZ14,947 per annum. The rates are subject toboth triennial review and intervening cost-of-livingadjustments.The Department of Human Nutrition has re-

cently been expanded and in addition to coursesfor the degrees of B.H.Sc., M.H.Sc., and Ph.D.is now offering courses in the Science Faculty forB.Sc. (Hons) and M.Sc.

Particulars are available from the Secretary-General, Association of Commonwealth Univer-sities (Appts), 36 Gordon Square, London WCIHOPF (Tel: 01-387-8572) or from the Registrar,University of Otago, P.O. Box 56, Dunedin, NewZealand.

Applications close in New Zealand and Londonon 30 November 1972.

DEPARTMENT OF PATHOLOGY OFMEDICAL SCHOOL AT MAJOR

EASTERN UNIVERSITYInvites inquiries from suitably qualified M.D.'s orPh.D.'s for one or more positions at the rankof Assistant Professor or Associate Professor Wyithmajor research interest in the field of:

1) Surgical Pathology-particularly bone, renal,or cardiac problems

2) Cellular immunology and immunochemistryApplications, including curriculum vitae and threereferences, should be sent to Box 327, SCIENCEThe University is an equal opportunity employer.

MONASH UNIVERSITYDEPARTMENT OF PSYCHOLOGYSENIOR TEACHING FELLOW/

TEACHING FELLOW(two vacancies)

Applications are invited for appointment earlyin 1973 as Teaching Fellow or Senior TeachingFellow in the Department of Psychology. Appli-cants should be graduates in psychology with agood honours degree or a postgraduate qualifica-tion of a similar standard. The department, whichis in the Faculty of Science, teaches a major andhonours course in that Faculty and a minorcourse in the Faculty of Arts. Research interestsextend over a broad range of experimental psy-chology.

Salary: Senior Teaching Fellow: $A5,441 to$A6,556 p.a., Teaching Fellow: $A4,465 to $A5,300p.a.

Benefits: Traveling expenses for appointee andfamily; removal allowance, repatriation after 3years' appointment if desired; temporary housingfor an initial period.

SCIENCE, VOL. 177

SPECIALIZED AUCTIONSALES OF SURPLUS PERIODI-CALS AND SERIALSMAXWELLS-the most experiencedauctioneers specializing in auction-ing learned journals and serials inSCIENCE, MEDICINE AND THEHUMANITIES.For free explanatory brochure as tohow to participate as a buyer or sellerin these auctions, and for the catalogof the results of the most recentlyheld auction sale, please write to ortelephone the most convenient ad-dress given below:Maxwell Scientific Intemational Inc.Fairview Park, Elmsford, New York10523. Tel: (914) 592-9141Bumpus Haldane & Maxwell LimitedCowper House, Olney, Bucks, England

Tel: (0234) 711529

MOSQUITO ECOLOGIST, Ph.D., to participatein laboratory research and field studies in Pakis-tan to assess genetic methods of mosquito control.Appointment for 2 to 3 years. Travel, housing,and American education for grade and highschool dependents provided. Salary commensuratewith training and experience. Submit curriculumvitae by airmail to: Dr. Richard H. Baker, Di-rector, Pakistan Medical Research Center, Univer-sity of Maryland, 6, Birdwood Road, Lahore,Pakistan.

WHO RESEARCH AND TRAINING CENTREFOR IMMUNOLOGY AND INTERNATIONAL

REFERENCE CENTRE FORIMMUNOGLOBULINS, INSTITUT

DE BIOCHIMIE, UNIVERSIT1E DE LAUSANNEAn Immunologist/Immunochemist is required towork in the field of humoral immunology. TheCentres are concerned with research into aspectsof immunology especially relevant to the pro-gramme of the World Health Organization, andpractical applications of advances in immunologyto problems of human disease. Candidates shouldhave good research experience in humoral im-munology and show capability in organizingresearch and in the supervision of research stu-dents. Knowledge of French would be an ad-vantage. Conditions of employment will beaccording to qualifications and experience.Inquiries and applications to Dr. D. S. Rowe,WHO Research and Training Centre for Im-munology, 21 rue du Bugnon, 1011 Lausanne,Switzerland.

RECENT Ph.D.

experienced and interested in mechanism of actionof strogens, estrogen receptor proteins. Immedi-ate opening. Send resume.

Box 339, SCIENCE

SENIOR TOXICOLOGISTHuntingdon Research Center-Towson, lId.

(Branch HRC-Worldwide) invites applications forposition of Toxicologist, Ph.D. or D.V.M. Ex-perience in safety evaluation of drugs, food ad-ditives, pesticides, medical devices. Salary com-mensurate with experience. Applications toDirector, Huntingdon Research Center, P.O. Box6857, Baltimore, Md. 21204.

VIROLOGIST, Ph.D.To develop antiviral evaluation program. Experi-ence with in vitro and in vivo systems desirable.Publication and participation at scientific meetingsis encouraged. Available 1 Oct. 1972. Salary open.Please forward resume to:T. E. Lynes, Ph.D.Newport Pharmaceuticals International, Inc.1590 Monrovia BoulevardNewport Beach, California 92660

The Market Place