Forthcoming EventsMay

21-22. Society for Econoniic Botany, 1stannual. Lafayette. Ind. (Q. Jones. NewCrops Reselarch Branch, Beltsville, Md.)

22. Nlar lkand Acad. of Sciences, Balti-more. (.. W. Flaster. Owing.s Mills, M\d.)

22-26. Air PollItion Contr ol Assoc.,5 3rd a1nnua1.-l. C incinnati. Ohio. (C W.GruIIher- 4(1214 Beckman St.. Cincinnati 14)

22-20. Oil land Cas Posswer Conf.. KansasC its. Nlo. (D. B3. NlacDoulcall, AS1 L, 29WV. 39 St.. Ne \)ork 18)23-25. American SOc. fol- Qal1itV

C ollt ol, aInIntl cons.. Saln FraniCiSCo,C alif. (W. 1). 'oLun1eclaLS. Jl-.. ,ASQC. 161W. Wisconsin N\VC-.. NIilssWLkee 3. WiS.)

23-2.5. N ationil TIelcimeteri n1 Conf.,Santat Monica. C.al11l. (A. F. Den-ham.n,American Rocket Soc.. 92i Book 13cldg.,Detroit2t6. N\ich.)

23 2-2. Fcchnicail \Nssoc. of thec Paper-aId Puilp IndusItrr. Chicago, 111. (J. WAin1-chlester- TA\PPI. 1 A5 E. 44 St., Ness:Yor-k 17)

23-2. Design En-gincerintg Conf.. NessYork. N.Y. (D. B. MNIaCDOLIugall ASMIE.29 W. 39 St.. Ncss Yoi-k 18)

23 2S. \merican C olIeec of Clatrdiologs%,9tlh attlnlnLl consV.. Ind1iana;1polis. Imdct. (G. F.(ic-eco. A(C 1 14-18 Lintein Blvsd., OzonePark 16. N.Y.)

2 2-82S. IlnStr Lrmcnts. Flectrconics. andcA\ltolmation1L \i ibition. Oln pip.l London.I uglad. (Industriall, ;hibitions Ltdl..Argll St., LonLdon, XV.l, England)

23 28. International Ceramic Cong..7th, Great Britalin. (G. N. Hodson, Or-ganizing CouLncil. c/o Hathernware Ltd.,LoughboroLtgh, England )23-28. International War- Prophylaxis

Cong. tfor Phy sicians. Noordissik ann Zee.Netherlands. (NI. Kn.ap. 46 SchUbertstraat,Amsterdalni. Netherlidncls

24-29. International COunCiI foI BirdiPi-esei-sat ion. 1 2th cong.. Tokyo. Japan.( NIMiss 1. Bairclas-Smith. Bl-itish MIulseuim(NaItur.al Histol s). C romssl l Rdi.. Lontdon,SW'. 7. nnlanti)

25-26). Reft a6ctori- NMetals andt Alloys,s! mp., Deti oit. MIich. (E. 0. KirIkendicall.AIIEL 29 W. 39 St.. Ness York 18)

25-5. Intei-national Fcledieati0on foIFIouIsin" a111uITOW1t Pl kinnill. wire.. PIuCI tORZico. (IFH I-I. Plalik Hotcl. MIolensti aat53. The HaLguC. Nlether lands)

26-27. 1ss chcophssiologic;l Aspects olSpace Flilght (Scihool olsAv ;.tion Mledticine.LJS,,'\F Aeirospac Nlcdlicl C cnter). ssnmip.,Sarin AntOniio. x.\ ( I. Har iion, SoLthss estReseCaliCh l1ist.. 8 )85 it lebhia Rld., SLanAnitonio 6 )

26-2S. Societs of Nasal Archiitectsanid Marine Filgillclr's spring, Washington.I).C. (W. N. 1Iaindcrs. SNAN\\F. 74 rini;tsP'l.. Nes '(oirk 6)

'29-4. Amricr can Soc. or HortictilItUr alScientcc. 8ti aniRIal ol Calblicani Reg0ion1,Sati JIran. 1'lICr to Rico. (I H. C assel-es,1 ondr-es 41). 0C.1F.1.. Nlexico 6. D.F.)

29-5. Ititeri-mtiolral C OiliiiissiOti O11Irl igatiti11ard I)r aitiage, 4th cong.. Ma-dridi. Spaini. (1). Dilz-Ambriionia. C omiteN.aciomtal Espariol, clo NMitisterio dCe Ohlrrl.

PVnblicals. Agustin de BethencouLrt, 4, Ma-drid, Spatin)

30-1. American Gynecological Soc..Williamsburg, Va. (A. A. Marchetti.Georgetoswn Univ. Hospital. Washington 7)

30-2. American Orthopaedic Assoc..Hot Springs. Va. (L. R. Striaub, 535 E. 7(1St., Ness: Yor-k 21)

30 3. Asilan-Pacific Conig. of Cardi-ologs, 2nd. NIelboLul-ne. Austr-Llia. (A. E.Do\cle. Alfred Hospital, Nlelbotirne, S. I.Victoria, A Lstrallal)

3()- Fibr-c Science. anlitiltal con)..I ondtmi. Englandl. (A. W. 13ennictt, TcxtileInst.. 10 BIlackfr at s St., MIanichester 3.I tirgla,1tid)

30- 4. Reactivits of Solidls. 4th inter-ni.ssymip.. Atiisterd,am. Nctlterlatiids. (It. G.van iijin. Secretarv, 4th Interni. Snsirp. onthe Reanctiv its of Solidls. Tcchriiscli Hoge-school. Lirilhoven, Nether-landls)

June

1-3. lnsti nimeimtal Mlethods of Analysis.an .tial .sSVip.. Montreal. Qulebec. CMatiCad.1W. [1. Kirshriick. InstriLriietit Soc. olAmierica, 313 Sixth Ave.. Pittsburgh '2)

1-3. Radar Ssviip.. 6thl arti itAl. AnArbtort. Micli. (XW. A. Blikkein. Willos RtiniI.tahoratories. P.O. Bo\x 0)08. Ann Arbor!

/-4. Amciricati Assoc. of Bioanakl stsarid C iliforitiia .Assoc. of Cliicall L abotl-atories. aririrral. San Fr;aicisco. C alif. ( Mrs.NI. K. Higgins. 75 Brerllra Vistat Ase.. SaiFraincisco 17. Ca(lit.)

I-5i. Itrigtation arid Dr ainage. 4th internl.con(., MNaIdtrid Spain. (D. Diaz-Ariibrona.

PHOTOVOLT Corporation95 Madison Avenue * New York 16, N. Y.

1324 SCIENCE, VOL. 131

REHABILITATION OF THE MENTALLY ILLSocial and Economic Aspects

A s' NIf)p)011/lu of*It1e /eriC'ican Psvcliiatric A. isso-c(latio), cospo;isorccl tb ef/i AAAS Sectioni oiSocial a(IIn(L(eonomi( S( ience.s ald the AmericanSociological Soc ie tl.

Edited bv Milton Greenblatt and Benjamin SimonThis volunc prcsents In IUp-to-dIte picture ofrchabilitation in its broadest sciesc. The contri-butions arc froom outstanldiniz rcsearchers anedpractitioniers inl the ficld. The process of rehabili-tationi is ex\aminied fronm the staindpoint of (a)hospital. (b ) tralnsitionlal aspects, and (c ) corn-muntity. The rehabilitatioll of the individcalI inlthe tottal scnise is secti as a conItitL Linm startingyfrom the momilenit of admlissioni to his finil re-settlcment in the communlity atnd mianiay tech-niqucs arnd recomimilenidations for improved patiientcare antd treatmeint are conltainied in the book.

December 959. 260 pp., $5.00AAAS NlemiblerYs Ca.-sh Orlers $4.50

English Agents: Bailey Bros. & Swinfen, Ltd.Hyde House, West Centrol StreetLondon W.C.1, England

AMERICAN ASSOCIATION FOR THEADVANCEMENT OF SCIENCE1515 Massachusetts Avenue, NW

Washington 5, D.C.

1-t-, a %

il : I I j-1111,-IIIO: " I I fill,f..

GLASS ABSORPTIONmadeCLS by KLETT

SCIENTIFIC APPARATUSKlett-Summerson Photoelectric Colorimeters-Colorimeters -Nephelometers- Fluorimeters-Bio-Colorimeters -Comparators -Glass Stand-ards-Klett Reagents.

Klett Manufacturing Co.179 East 87 Street, New York, New York

new CENCOMoisturehn I nroIJCUIalI.~1 -. - - a0

New improved design offers greater convenience, accuracy,repeatability. Simple to operate. Drys and weighs simultane-ously. Moisture-loss results in few minutes read directly fromcalibrated scale. Features new built-in autotransformer andextra deep disposable weighing dishes. Cenco No. 26680 each

$295.00

CENTRAL SCIENTIFIC CO.A Subsidiary of Cenco Instruments Corporation1718-M Irving Park Road * Chicago 13, III.Branches and Warehouses-hMountainside, N. J.Boston . Birmingham . Santa Clara * Los Angeles * TulsaHouston * Toronto * Montreal a Vancouver * Ottawa

29 APRIL 1960

\+ ITwo NewCatalogues

RADIOACTIVE CHEMICALS

RADIOACTIVE SOURCES

Information on theIt comprehensive range of

radioactive materialsoffered by the Radio-cheniical Centre is nowconvenienitly divided intotwo catalogues. Thecatalogue of Radio-chemicals includesinfornmationi on prinmaryisotopes and labelledcompounds of interest toall who use radioactive

RADIOACTIVE tracer methods and alsoCHEMICALS radioactive pharma-

ceuticals. The catalogue ofRadioactive Sources

d" containis information onsealed radioactive sources

and appliances of interestto researchi workers,radiotherapists andindustrial users of ionisingradiation. Both cataloguesalso include informationon radioactive reference

A r ( sources for calibratinginstruments and on

.... ........ irradiations in the researchreactors at Harwell.

RADIOACTIVESOURCES

REQUESTS FOR THESECATALOGUES ARE INVITED

THE RADIOCHEMICAL CENTRE

AMERSHAM- BUCKINGHAMSHIRE ENGLAND

TAS/RC.47

1325

I

C omits Nacional Espanol de la CoirnisionIhiternational de Riegos v Drenajes, NMinis-terio De Obras PUblicas. AgLstin De.IlcthelcotLirt 4. MaLdrid)

2-4. D)rulgs Affecting Lipid Metabolism.initernl. symp., Milan, Itaily. (S. G arattini.c/o InstituLte of PharmacologCv Via delSarto 21, Milatn, Ital)

3-8. Pan Amet-ican Mledical Women'sA\lliance, 7th cong.. San Juan. 13uIer-to Rico.(MNrs. S. D. Rosekr.ans. )504 Newstt St..NuLissVilIc, WAis.)

-5-8. Special Lib,ari-.es Assoc.. 5 1 st ani-nual, Clcxveland. Ohio. (13. NI. Woodls. SLA.11 E. 10( St.. News York 3)

5-9.9 \me icain Soc. otf Mechanical E -

ginleers. SltiiimetCI Intml atild axVi.atiOI Coll..

H-2424-Balance, Analytical,Sartorius "Selecta Rapid"model.Capacity-200grams.Sensitivity-t/10 mg. SinglePan. No weight handlingWeights are an integral partof balance and are addedby flick of external knob.

Price $890.00

H-1823-Balance,Analytical,Becker Model "AB-2". TwoPan. Dial reading, chaino-matic, with notched beam.Capacity-200 grams. Sen-sitivity- /20 mg.

Price $449.00

These balances are iust a few of theB-ninany balances niaking up our completeline including Micro. Semi-Micro, Spe-cific Gravity, etc. Write us regarding yourspecitic steed.

Dallas, TIex. (L. S. Dennegar. ASMEL, 29W. 39 St., Nesw Yorik 18)

5-9. World Power Conf., Madrid, Spain.(D. J. Perez, POzualo, Spanish NationalCoommittee. Generlal Pardinras 55. AMadrid.SpaIill)

5-10. National Conf. on Social Welfare.annUal, Atlantic City, N.J. (Nailt. Contf.on Social Welfare. 22 West Gav St..COlimbLuS 5. Ohio)

5-14. XXV C'oldl Spt-ing Harbor Symp.on Qutatntitatixe Biology. Cold Spring Hal-rbor. Nit. (A. Choxvnlick. Biologica I _ib-or atorxv. I ong IslaLnrd Biological Assoc..Cold Spritic Hahror)

6 8). PrOtCHo1i SttLoct ean I net on.3th sX mp. in hiologs lPtpon. N. (1).

A Balance for every weighing ... anda Balance that will perform the weigh-ing to the accuracy required in the

shortest possible time. Most of ourextensive line of domestic and im-ported balances is illustrated and

described in the 32-page HarshawScientific Balance Bulletin. Do youhave your copy? In addition we will

gladly furnish detailed informationon particular balances.

H-1642-Balance, Analytical,Ainsworth "Right - A- Weigh,"Type SC. Capacity-200grams. Sensitivity- /10 mg.Single Pan. No weight handling.Features substitution weighing.

Price $895,00

H-2400-Balance, Analytical,Sartorius "Projecta Rapid"Model. Capacity-200 grams.Sensitivity-1/20 mg. Two pan.No weight handling up to 10grams (weights up to 10 gramsare built-in).

Price $645.00

H-1905-Electrobalance, Cohn,Range Selector Model. Formicro weighings quickly andaccurately. Maximum range-0-100 mg. with 25 microgramssensitivity. Four other rangesdown to 0-i mg. with increasedsensitivity.

Price $695.00

H-2440-Balance, Analytical,Voland Model tOON. Capacity-200 grams. Sensitivity-i/10 mg.

Price $125.00

L. Koshland, Jr., Dept. of Biology, Brook-haven National Laboratory, Upton, N.Y.)

6-10. Internlational Conf. on Live Polio-virus Vaccines, Washington, D.C. (Secr-e-tariat. Pani Anmericani Health Organizai-tion Workl Heailth Organizattion, 150 1Ness Hampshire A c.. NW. Wishingitoi( . I).C .)

7-11. Microwave Ttibes. intern. cong,NI ullich. Germany. (NachrichtenitechnischeGesellschlift iii Vl)F- (NTG). Frankftilrt-aimi-MNaIin. Osiihafenplatz 6, Germany)

/3. Dosimictr in Heallth Phxsic.s nip. Vienna. Austria. ( Inic nationail-\toiic EVnergv Agncyc. I I Kitlitier- Ring.\ nianc K\llstIl'ia )l-3I.ai'rtial Dilltercitiial Equciations and

(Contituill Nlechililics. iitcim. conti.. Niad-so)n. W's. (IR. F 1 anget NILItheni.itics Re-search C entetr. LJ.S. /\rnx IUnIvix. of WNiconisll MaLidisoti 6)

8 --. SeleCitilii in NtittiitioIn. conf.. lthacai.N.Y. (K. C. Beeson. .AS. PlaInt. Soil. arid

!Nutiitioi1 abIalrl;tot s Ithacav.. N.Y'.)8-1. Caitidlimd FederatioiloBiolo-ical

SocieisiC anadiati Plh siological Soc..P)a1rl-mcoloule.ill Soc. ol Clatllad. Cianadllil.s"-(C. OI' A\lltomiits. C aimldcla Biochticiil

cail Soc.). 3Ird amtitiil zttie. NianitobstIiF. II1. Benslev. Mlontte,t (etierIa Hospital.651 C edar Av.\x. Nlontitreal 2'. P).Qo

_80 N01-111ona11So.Socol 1P(1joessional IF11n!itineleS. atitittal. B3ostoIn. Ma;iss. (P. I-1.Robbins. 'NSPI'.-0h29 K St.. NWV. Wash-tIcton 618. 1 Atiritlii College-, ol Chicst Pli\-

c'sinias. NIMiatii Bcach. Flia NI. KoIKrfeld.2 1. (lic'sitit St., liilgo 1 1. 1I1.)9_ /0. A\iitrcan GeClrlltcs Soc.. I iam

B1.tchIi. FLI. ( R. Kt aetiict 2)917 lost Rd.Watss;ick\i. RI..)

9(-. Can-tidia lust, of Food Techiiol-I0gxV. cId anial; conf.. Winnlipep. Nlanitobi.. (W. 1. Fx a. Box 846. WinnipeC.Nianltoba )

II. A eoL st Ca SOC. o f A IIt ica.C IOde(nce. R.I. ,WS. atel\ill. .AS. 3' F F. 4Si.. Ne \'ork 17)(- / 1 1-idocrine Soc.. NI al 1iii Beach.

VIai H. H. Turinetr. 12(11) N. Walker. Okl:-holoii; itx 1. Okl.a.)

9 II. NaItional Spelcological; Soc.. an-ntl,(1. C-;alsbad. N.NM. (CG. W. Moore. LA .SGCOlOgi-jCa1l StLrses\ MNleilo larrk Calif.)

12/. \rneicritci Nlecdical WOIniei'sI\soeC.. liatiii; Beach. Fla. (Mtr. 1 1IIa aIls'. 1791) Broadxswaxv- Nes YoIrk 19))

9 1. AtiieIYca1n1 Rhlitiiiatism Assoc., ati-ital. HolllvssOOd-b\-xthe-Sca. Fli. (F. F_Deii.artiiii. Pt csb\ itCi-11 Hospita. 622 \,V.168 St., Ness York 3-)

9-12. Amierican Thietrapetic Soc.. MianitB3acich. Fla. (0. 13. Hunter. J,.. 915 19 St..N'W. Waishilngton 6)

/f)-12. Amniericatn C ollege of Aigiology.Nli aili Beach. FkIa. NA. 1-ialper n. 11 Haimp-tOll ( oLirt. Grecat Neck. N.Y.)

/(0 12. American F] ectirocicepialo-griaplic Soc.. 13oston. 1\1ass. (G. A. Ulett.1421) Cratteti St.. St. LoLuis 4. Mlo.)

10)-12. Socictx for Biological 1sv chiatr\,Miami Beach. Fli. (G. N. ihonipson 2(11(1Wilshire Blvd., Los Angeles 57. Calif.)

11. American Acad. of TubercUlOsisPhysicianis. Miami Beach. Fla. (G. P.Bailey, P.O. Biox 7(11 . Denver 6. Colo.)

11-12. Amer-ican Diahbetes Assoc., MiamiBeaich, Fla. (J. R. Contiells. F. 45 St..Nes Yo0ri 17)(S'S' isst, o/f 22 Aprinil forit c(umpre hnt's i'silisr)

.S('11'N'('F, VO1. 13A11326

.M

-ammomp-p-lw.m-,:.- -I":., o

.7..

4J

6

".- -Ar-..- -.

.11,qv,

4-0fw .1,

i

0

-W-

EXPOSED--

I) I to -i

0 . . tcross-infection!Hands-most active in distribution of STAPH! Unlesshands are washed after each patient contact, theyare dangerous cross-infection carriers. Every dress-ing . . . every lesion . . . every collection of speci-men, blood, sputum, etc. requires hand service.

Eliminate contact! Use the modern pressure-sensitiveTIME Labeling Tape. Break the chain of cross-infec-tion of STAPH, TB and Hepatitis!

A qualified consultant will teach you the effectiveTIME labeling procedure. It's your first step to asafer hospital. Write today! Dept. RH

PROFESSIONAL TAPE CO., INC.355 Burlington Ave. Riverside, III.

UNITRON stereo microscopes..aslow as $110

Both models offer ... sharp clear erect image . large depthoJ Jocus . wide field . long working distance . interpu5iillaryand diopter adjustments . rack and pinion foctusing . coated optics

MSL- a precision,budget priced instru-ment. Vertical binocularbody. Choice of singlemagnification from 5X to45X. Extra eyepieces foradditional powers,$19.50 per pair. $110AVAILABLE FOR FREE10-DAY TRIAL . . WRITEFOR FREE CATALOG 4B-

MSHL - a versatilegeneral purpose instru.ment with a wide rangeof magnifications. In.clined binocular body, re.volving nosepiece forrapid interchange of ob.jectives. Model MSHL-1with objectives: IX, 2X,3X; eyepieces: 8X, 12X,

ACCESSORY STAND - For use 15X;magnification range:with binocular head and focusing 8X-45X. Other magnifi.mechanism of either Model MSL cation rangesor MSHL. Price (stand only), $75. available. $267

METROHMI

-A- L U

A major disadvantage of polarographic methods, especiallyin industrial laboratories, has been the considerable timeused to run a complete test (polarogram). A minimumtime of from five to fifteen minutes is required with allDC polarographic recorders currently available fromcommercial sources, both here and abroad. These delaysresult from the dropping time of the mecury electrodewhich should be in intervals of two to five seconds inorder to obtain a sufficient number of measuring points.

Recent experiments at the METROHM laboratories inHerisau, Switzerland produced a major breakthrough tothe "time problem" - Rapid DC Polarography. With thismethod the mercury drops of an otherwise normal droppingcapillary are mechanically induced to fall at a muchfaster rate. Consequently, artificial drop signals measuredin tenths of seconds are obtained. Since a considerablygreater number of individual drops are utilized, one canalso increase the speed of the potential change. The normalrunning time in Rapid Polarography is 50 seconds. With adrop interval of 0.2 seconds there are 250 drops on thepolarogram. To obtain the same number of measuring pointswith the standard method would require a running timein excess of 12 minutes for a drop interval of 3.0 seconds.SEND FOR COMPLETE DESCRIPTIVE CATALOG TH 25IPm

29 APRIL 1960

I II

---------- l- -I 11111-------------

%I

I

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ii

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g A,4 a,:.:.v

11M.

I

r... Apith,., Jr -%.2 WP

1327

a review of recent animal e Ccare developments from I19191, J

General purpose fiberglasscage #12 with Lid 12B is11 x 8i2ux 6" deep

Mouse cage #22 with Lid 22A,of fiberglass, has four lidstyles, is 11-" x 7E2-' x 5"

Holding and breeding cage #32,of fiberglass, is shown with Lid32B. Cage is 19" x 10'2 " x 58 "

Restraining cage #90, for immobil-izing and holding rats up to 300grams, has many applications

Newly developed all metal lidswith single piece deep drawnfeeders come in several sizes

Polypropylene cage #25 and clearcage #23, bothI 1yZ2" x 712" x 5", arenew additions to the Econo-Cage line

Lightweight Econo-Cages are made with corners and edgesrounded and seamless for easy cleaning. They are resistant toacids and staining. The low thermal conductivity of these unitsreduces animal and weight loss from chilling and upper respira-tory diseases. Fiberglass Econo-Cages can be autoclaved repeat-edly. You can select from a variety of lid styles and componentsto suit your exact needs.

For the most up-to-date animal care product developments keepin touch with ...

Econo-Cage Division, Box #4 e c o n oMARYLAND PLASTICS, INC. -Ic aige

Federalsburg, Maryland i I

1 328

Nev ProdutctsThle informiation reported here is oitiiiiie(d from

mnilf(acturers (11(1 from ot7lier souilrcev cot iideredhto lie hlialh e. .N (1ithr Scietice tior thle writer a.s-

| imes re.pon',v i ilit fotf(le uiccuracY of the ini-foi,1ii,,tioii. All iiquiiric'i (coi(crnlili itemii lited/ihou/l b e adIlrei'sed to the maillufiicturer. 11-

(lud( (tIh depatirnmieit miomiier 0111 iiquirYi

* PROXIMITY TRANSDUCER meaISu-ressmall mechanical displacements at fre-quencies from 0 to 20,000 cy/sec. Cali-bration can he performled undler dx -

namic conditions, a minicromiieter headon the transdiucer is calibralted directlyin 0.0001-in. units. OuLtput is designedlfor cathode-ray-tUbe display. (PhotoconReseairch ProdLucts, Dept. Sci480, 421N. Altadena Dr., Plasadena, Calif.)

* AUDIOMETER provides signals at fre-quencies 500, 1000( 2000. and 400(0cx 'sec at three intensity levels. 15. 30.and 40 db. Frequency aIccuracy is saidIto be - 10 percent land amiplitudle .ac-curacv 2' db. Selection ot each signalis provided by 2 push buttons. Facili-ties for as many as si\ telephones or adloLuble headphone wxith chan-coverswx itch and bone condLction can beproxidel. (Technisch Handelsbure.Dept. Sci482, c, o Netherlands TradeComimlission. 55 Fifth Ave., Ne\,York 17, N.Y.)

* COOIRDINATE INSPECTION N/I\A HINIpermlits inspectioni otf machined w orkto an accuracv of )0.001 in. withtravel 24 by 15 in. Vertical travel of0 in. is not usedl for measurement.

NMotion in the x and y directioins ismeaesLired photoelectrically by the Moirefringe pattern generated by crossedgrattings. Measuremiient informiiation is

displayed continuously by two 5-digitcouLnters. (Ferranti Electric Inc., Dept.Sci492, 95 Madison Ave., Hempstead.N.Y.)

* [)ATAS PRINTER iS a m1iniUturized dc-vice w eighing a feCNx ounIces. As manyas 9f) dioits are printed simIltaneousivon electrosensitive paper when appro-prialte elemients of an array of stainless-steel printing segments are energized.Operating powter is said to bee loxenouLgh to eliminate the need for isola-tion and driver stages to couiple thedata-prodLcing device to the printer.(New York University, Dept. Sci493.University Heights Center, New York53. N.Y.)

* CON[)UCTIVITY METER is a portablebattery-oper.ated meter dlesigned to readparts per maillion of solite in saline orother solutions. Meter ranges are froml0 to 1 00,000 parts per mlillion with in-cremilents down to 0.5. A temperatLirecompensation adjustment is provided.Weight is 1.5 lb. (Carmia Mfg. Co..Dept. SciS05, 1879 Mullin Ave., Tor-rance, Calif.)

SCIENCE. VOL. 131

* SIGNAL GENrt%t .iAR furnishes crystal-controlled calibration frequencies at in-tervals of 100 kcy/sec from 300 to 1000Mcy/sec. Intermediate frequencies arecontinuously tunable with error of+ 300 cy/sec. Auxiliary equipmentpermits the crystal-synchronization in-terval to be reduced to 100 cy/ sec andthe continuous tuning error to 0.1cy/sec. (Electronics Applications, Inc.,Dept. Sci497, 174 Richmond Hill Ave.,Stamford, Conn.)

* ELECTROMETER features miniaturizeddesign that permits two electrometersto be mounted in 31/2 in. of a standardrelay rack. Highest sensitivity range isI -12 amp, full scale. Specifications in-CILIde: accuracy, - 2 percent of fullscale from 10` to 15` and ± 3 percentin other ranges; drift, less than 2 per-cent per week, and noise, less than 2percent except on the most sensitiverange: input drop, less than 6 mv; full-scale output for recorder, 10 mv. (GyraElectronics Corp., Dept. Sci495, P.O.Box 184, LaGrange, Ill.)

* INTERFERENCE FILTER iS said to re-move ultraviolet radiation completelyand reflect infrared radiation. The filtertransmits about 90 percent in the visiblefrom 425 mn11 to 700 mn.e and has asharp cutoff beginning at 700 mjt. Thehalf-transnmission points are at 412 mnton the short side and 725 mnu on thelong side. (Fish-Schurman Corp., Dept.Sci504, 70 Portman Rd, New Rochelle,N.Y.)

* PRESSURE GAGE is designed for usewhere smnall differential pressures atrelatively high line pressures are to bemzeasured. Sensitivity is 0.1 percent andaccuracy is + 0.5 percent of full-scalerange. Two models available have full-scale ranges, respectively, of 2 lb/in.2differential at line pressure up to 50lb/in.2, and 5, 10, or 20 lb/in.2 differ-ential at line pressures up to 300 lb/in.2Dials can be supplied calibrated in anydesired units. (Wallace and Tiernan,Inc., Dept. Sci509, 25 Main St., Belle-ville, N.J.)

* TIME ANALYZER analyzes the distri-bution of nuclear events with respectto time. Information is stored digitallyin 32 consecutive gated channels ofvariable width from 1 1msec to 0.08 sec.Channel scalers have a double-pulseresolution of 1 ,usec and count up to2500/pulses per second. Each channelhas two electronic counting units anda 4-digit mechanical register to provide10' number storage. The total numberof pulses entering the analyzer is alsoindicated. (Eldorado Electronics, Dept.SciSOO, 2821 Tenth St., Berkeley, Calif.)

JOSHUA STERNNational Bureau of Standards,Washington, D.C.29 APRIL 1960

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Geneticist-Cytologist-Electron Nlicroscopist. Ph.D.Specialized research, teaching experience. Micro-biology, botany background. Publications. Box83, SCIENCE. 4 22, 29

Immunopharmacologist, Ph.D., desires to conductresearch on purification and therapetLitic uses ofantibodies and enzynes. P.O. 333, Davis, Cali-forriia. 4/15, 22, 29

(a) Pharmacology/Physiology Ph.D.; facilty ofleading medical schools; extelosive ptiblicationsoni CNS, cardiovalscatt.r, respiration, shock, ten-sion research; availa:ble for acaidemic or researchappointment. (b) Zoology Ph.D., human anatomyminor; 10 years of anatomy teaching at medicalschool, neuroanatonoy research experience; pre-fers academic teacloiiog and research opportunity.Medical Btireau. hllc.. Scietice Division, BuLrneiceI arson, President, 900 North Michigan Avenue.Chicago. X

Physiology-Endocrinology, Ph.D. Background-train-ing in endocrine, cellilar, mammalian, zoologicalphysiology; biochenoistry. Academic or research.Box 98, SCIENCE. X

||||||||||||||||||| POSITIONSOPEN

||||||||||||||||POSITIONS OPEN |||||||||||||Faculty of Agriculture. The University of Albertainvites applications for a position in the De-partment of Animal Science as Assistant Pro-fessor, starting salary $6000-$7000 depending onexperience and qualifications, excellent prospectsfor advancement. Candidates should have aPh.D. or equivalent in animal physiology with aminor in biochemistry and be quLalified to con-duct research involving the clse of isotopes.Duties, to commence 1 September 1960, includefundamental and applied research with farm andlaboratory animals, teaching and limited exten-sion work.

Applications, accompanied by a recent photo-graph, and giving age, nationality, and otherpersonial information, transci-ipts of academicrecord, list of publications aind experience, andnames and addresses of three referenices, shotLildbe addressed to the Head, Department of AnimalScience, University of Alberta, Edmontoni, Al-berta. Closii:g date: 30 June 1960. 5/6

Botanist. Experienced in microtechniquLe andgeneral botanical preparation. For work withwell-known biological supply house. Preparationof slides and other demonstrations for botaniyand general biology. Male or fem,ile, preferPh.D.; M.S. and experience acceptable. Goodsalary, benefits, paid vacation, and sick leave.Opporttinity for advancement. Reply to Box 95,SCIENCE. 5/6

(a) Microbiologist; Ph.D. or equivalenit trainingto serve ats head, cell production facility. con-duct cell culture research: mutst be familiarsingle, suLspended. mnonolaver cell cciltLire te-cl-niqcLes. related prcocedLtres; midst esternt officepromlnetot pharmi cetLtical compatny. (b) Pharma-cologist; Ph.D. to estiblish evaltLiationi progrimassociated toxicitv stcidies in new druLg screeninig;report to director. phairmacologic reseairch; to$8500; miiidwsestern scUbsidiars. prominenit com-pany; Chiciago suLbuLrb. (c) Biochemist; Ph.D. totraini in-plant visitors in cotllgL.ationi. relatedproblems; keep .abreast of competitive produLcts.developmcnts; give seminars in coagtltation, re-lkited areas abotLit $10tt.titi(l; East (d) Bacteriol-ogist; B.S.. AM.S.. fos constilting tirm doitng drLigevalulatio:is, v itarin:, hormionen. toxicoloigical is-satys; sciperior f.acilities: to $60)()0; Midwsest. (e)Biochemist; M.S., Ph.D., to head department.30)0-bed Chicago hospital; minimuLm $8X()()).(Please write for aI .inalysis form. OLir 64thyear: Fotci:ders of the counsellins service to themedical profession. Serving medicine with dis-tinction over half a centurv. Science Division.Woodward Medical Bt:reau, Ann Woodw;vrd, Di-rector, 185 North Wabash, Chicago. X

Microbiology Graduate Assistantships toss ardmaster's degree; $18110, free tc:ition. Excellentficilities. Phone itnqtiiry collect. Orton Stark.Miami Unliversity, Oxford, Ohio. 4 22, 29

~~~~~~~~~~~~~~....

INTERNATIONAL SEARCHHOpportunities for Physicists- Physical Chemists- Fiber Scientists

FIBER CHARACTERIZATION RESEARCHThe planined extpansion of the progs atns and staff of the Che:::strand Researc: Ce:iter. ltlc. iltvo:otestablisl:nient of a Fiber CIharacterization Section to

* Characterize experimental fiber forming materials, relating their properties back to theirmolecular structure and forward to end product performance

* Develop fiber evaluation techniques and instruments* Perform physical analysis associated with fiber, yarn and end product evaluation.

Challentgin:g a signnienttts are avsailatole at seteral let els of res :on:sithility intcluodin:g directi:::L of tileecSect ifn' act:i viiti eS. A:alednfic trait:ilng in 'hysics Physic l or Polsyoer Che:::istry (r ibtr

Alethanies antdl ton:side:rahtle experience it: thie alovso areas of thef textile fiter ant3 relat,: fiells a:reptereqltisite for ttie inrthivid1ual selectc d1 to head this progran:. Dtem:ionstratedi ahility toc orgai:ize anda(l:i:iinister hioad(l thecoretitalt anti applitei researchi studies also reqttiredt Siti:ilar trai:lit:g aind inttrestshut less extperiei tee needed for :titer interesting opporttunities in: this gr: cup Tuie i::ipoi tatiec arid coniplexity of this fttitnlaitetnttlt insestigationtal sork will be recognized it: cotmmtttensurate salaries anlprofessioina:l climtate.

The l het:nstrait( lReseart C:(eniter, Inc-a ssliolly owned suobsidtiary of the young a::d vigorous00 Chemttstrandt Corporitioni still retlo:ate in late 1t960 froirn its presettt lDecatur. Alabamisa site to riess lai:orar-tories it: the lRecreal: Ti i;an:gle area of Norti (Carolina.

Fturcloeal: inter: iews csa:n hte arr angedt for applicants *lto are noncitizens of the United States a::dhai:e deci(le:d to in:migra:te to this cotitItry.

If you are interested in associati::g wsiti these new progranis of an expanding research organizatio::,contact or sen(i rescLII:e of atcaclemnic backgroua:d anrd exlpericnce in strictest cottlidence to:

MANAGER, TECHNICAL BOX R15D

EMPLOYMENT AND THE CHEMSTRAND CORPORATIONRECRUITMENT DECATUR, ALABAMA

1329

INFORMATION SCIENTISTEXCELLENT OPPORTUNITY FOR SCIENTIST (Ph.D. OREQUIVAl ENT) WHO IS INTERESTED IN WORKING WITHLITERATURE. OPENING IN RECENTLY ESTABLISHED ANDCURRENTLY EXPANDING INFORNIATION DEPARTMENTOF PROGRESSIVE CENTRAL NEW YORK STATE PHARMA-CEUTICAL FIRNM. ASSIGNMENTS Wll L INVOLVE CONTACTWITH RESEARCH STAFF. SC REENING AND ABSTRACTINGUNPUBI ISHED DOCUNIENIS AND ANS\WERING REQUESTSFOR TECHNICAL INFORMATION. PI EASE FORWARD RE-SUNME 10:

PROFESSIONAL EMPLOYMENT MANAGEREATON LABORATORIES DIVISIONTHE NORWICH PHARMACAL COMPANYNORWICH, NEW YORK

END)OCRINOILOGISTSpecilfizitxcx in cctlondocxiolxoyx of repro-dcxltiotit, to he responxxsible fox .a biolxxgical.ree.seacit pxrx' rlxxx dexailiml"x -ith fetrtilxitx . Fiv eyc.ers postxdcxtoxrxtexxxpcricxinc cesireti1.Lartge plim-.iticcxtIcl coxixpanyix l tlxe lE xst.PleISCe sexIlid cSLxxxxx ot cixx.ltiOll .xxcl experi-xiecc to

Box 78, SCIFNCE

HISTOLOGYSUPERVNISOR

Experienced in neiUro-histoloivpIlIs college degree. Interestinm andunusLial research program oilerschallenging, I'uture.

Personnel DirectorMONTEFIORE HOSPITAL2 1 0 St. & BKainbridi,e Ave.

New York 67, N.Y.OL 2-7787

;x) Mticrobiologist to cliicit act xe dcepax-tixIciltIxx 1iix-ge Uivxxsesit\x hcospxital, S900111 S122.11000 \xtriI .-st. (b) Radiationi Biolog) Teaclier ccxrixxhcindw ith phixsioiogc xI zoctiloc ; coxcirxscs; .xssxoci.tcpilofesscu ox prt'cissxxr lcvc7li EList. (c) Parasitol-ogy Research Associate oxx mxxedical scixxil, Texas.(d) Physiologist/Plarmacolotist fox- lexxdinxcx pihx-mxaxcextii.clfxirhrx: x -ticLxxIxC S1(.11(111 eCxtr Nlixcs eSt.(e) Pathologist. NI.).. Phu).. or D dg'NI. cieic;clinicxli ixnd .itnitii cxpCi teiice pPt fccri-cd fox- re-scircxh l,iboxittrics. Vexe 510.()()i): Soiti. (f) Bio-chemist fcxx pep iixc recxeiicih. S6(000-11 10t0.(100 eur,SoItixxx est. a I'llh siologist or Bacteriologist toIxcid xcxnw ecticxoxiii mxi crxoscuopx dccpaiirtmenxet xIxresearcc ixlstittitic SXIl000 \c xt tip-, Nidxest. (h)Py) siologist fox- bhsic resc.iixix cxxx brx ixt ftixtictixx s

' leilding clxxivcrxsxixt ELst. (i) Head olf Physicst)epartmelit III xcxx sciciic'ehbclildinc of st.ate Lixix-sexrsits; S1()(1()11 105(A)0.ll( vexr: Nlxdx cst. (ii BotanysF"actilty Appointment fcox teachicic ainid r cscircih;rixcv sx'cetoce hbilixixtlcx'i cc cxixletvsits'icixltix1P1ic1ic x ritc lxOi- dctilsix; liiso tilxri\o otiiex posi-ixOIis ;Ix-Iii lIc MWxlii'xxIii 0111- xx.xtiMxxxwidci sc'Ivice.)S4-5 M\iexiic.il Blxrc.ILx. I xc., ScicixCe Dix lxolltiixIxtixecc Lxrxsoii. Pi esidcixet. 911(1 NxoithMiIcixxcx.xxiAx CxlUti. Chioc.xgc. x

licrobiology of Coal and lPetroleuim. Tue Re-sxertch C'OLItxixC ofx -MberNtix hxs iopcc ipeixcgfx rbrlliciihixolcOiist tO polxtitiip.xto ilt researxcc de.xlirl-W Itix ttue 'x. CxOil txxxitLi'txix arid xxtiliziittion offiOssil fIcciSi. xsIxt 1c pi xjcCts ixclV V 11 ItiicxxIx(biologx deal x ithi tie dcvi cilopmxenot of poi pilsciptoxricxxits itt citcicl xxxoil ixic \xxith ntictcrobhioloxic.loxidaxtion cxf xrmxtlOtic' t1s di cxci boxils. Ilxncstxpai -

tiolxis of ttle x' xxlxi1 cxlill)tixitCIs iIl bicxtli xil 111dicoaxl tICI of 11liiiixciixtin pi xocesses rx c ott iccd.Ihcixee will be opxp rictixix to p.rtitcipatc ill tueclioice aicid planttixtig of t-cse.lrcic pt cox-i xisx ixic.nilxope sxope foli ilidixidcl.ll scietilic desclop-xlcixt. Salaxrx ccicrident oii qxldifiic.iOxFIS. NI ike-ItpPi, xtxxx tFoic Secretacrxyx. IteScItCllx CoxLiClof Albcrtat, 87thx \xixic ,ixcl 114thi Stixcet, Ed-txiotIxtoi. Albcxte .x. 5/6Science Teachers. Librarians, Administrators tir--clitl iCxcdCLJ txxx- positicoxns ixx ntxianx st.xtes inidorx c'xcrx x;lds. )Ixixithixi xioll-fcc plxccl'xctIt jcx11x11xii

itwice 19-'2 xivc c(xriipictc job ci;t;. S.xi.x CS. Nlen-xci s' qllix lcic.txoxi, .tilc x xci tllcics listecl ft-cc. IiSSLce. $1. Ye.irlx (II issuLes) menmbersixip. $5iticisiciii.id 811 iVdI ittitxixI;.i. CRI'S A )E. SCIBox 99, St.xtiwix ( ,. Bi-ookri 22. N. coxi'

Scienitist. Ph.). xx itxx -ixde bh.ck-rioxtind itn sciextce,pre'c r'Ihix hIxit''xx xix ',xxttx tx.xItxx''x ii xxtxxxtixties intictox scialx diences. Te.achixng ito gpexncr xleducictioi Prtoxxiixxm ill Lirxtcc midwdcstclx lecx li\'Cxl'-sxit (l)txp1-txLI fox- xrcscarchx; exmpixsis x1xtexetC'hixi'l lxxx i ,txx istxtx prtfessor ilxeci. Box

V irologtist. Si lili0 x0xannually.iiixY.ealiIs incremenixtexiFxxx rcscixrcih xxxi .xxn .Im xxtxxxxr Vx ixxscsx Nicro-biolog.ist. Sdxrvx (IcpcIdsp idbxx ckptIixitxI ;x111Ixexpctic'ixce. FOI axn1ximxiil dciiseae rcxschixci. BotliPoSit iOxIS IxIcIxIcie .xc-leqUipped labhiu .xtoic .xnxd'tSSibhI]t\ ot iciderxic ptpocintmxctent. Vs itc toC 1ix.xxt t-mxnx D)cp.rtmxxnct of A\pptlici VetertxxxrsNlccixci Sexcixces. Scixoxl of Vctexlinirvs Medicinie.Unxix cx,sitv of Pcnnsvixi xxxi.ai Ph i.iciLitdilpti 4. l'1.

xVirologoist I1I, x Ph .D.. to lie-Id pihlic hxealithvii-tis laboratiory cm,a ged in di.'t'rIlostic .tInd re-scxl-cih icts itic. SiStlte cvxil sertsice xxithx etirementPixl. PIIxi SOCi.i sexCtLl its. Stxt titi .s r58-l8435to i11.774 axxi ixixin. \\Writc 'Michixaxin Cixil iSe-ice. l(ccxruiitxelxt Zlicli Placenmenxt Ian.sxsixncx 13.

xlicix., for ftirtixer ixformixaxtion. 5/6, 13. 211

Tl co postdoctoralx traiiiicsixips ino Sensorv lPlys-iologt (fxtcicitors tind o- pxretxxitl). Ccor tueI. 1). ixitct esteci in itolxixc lx rescarch itnci or

tixc I11 . 1). in xx sixlxcx-. xrx.xtxxxooxy ioxopixy sics,Oxr c'xpcr imtalcxxxxi pss chioxixoy StipeCx1cis. xxl e Isvt.xx fi-ce. s16()(() per y car. cip tci 3 x e.trs. \i\ritetxo I xc Dcxi tess escircih I-ahor.atxxry, Cxlil-xir ext's liostitpltd 4f 14 Sxtliset Blc. I is XiicxcIcs"7. (xlii. 4 * s 2 299

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