I1 Two New Catalogues - Science...bryo", hlelcd 27 December 1955, at the Secondi Atl.anta Meeting of the AAAS, scrvcd as the basis for this VOlILum. EImlphasis swas placed on the problcmis

A 0AA0

Information on thecomprehensive range ofradioactive materialsoffered by the Radio-chemical Centre is nowconvenienitly divided intotwo catalogues. Thecatalogue of Radio-chemicals includesinformation on primaryisotopes and labelledcompounds of interest toall who use radioactivetracer methods and alsoradioactive pharma-ceuticals. The catalogue ofRadioactive Sourcescontains information onsealed radioactive sourcesand appliances of interestto research workers,radiotherapists andindustrial users of ionisingradiation. Both cataloguesalso include informationon radioactive referencesources for calibratinginstruments and onirradiations in the researchreactors at Harwell.

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N ATI O N A L A P PLIA N CE

362

MeetingsHistorv of Science

The 9th Intcrnationail Congress of theHistorv of Scieince convened in l3ircc-lona. I Scptemnber 1959, bringillne to-,cther scholars tirom miany natiollsAAraiaIi.L, AuLstria1. B3Clgiuim. Canadi.CzechoslovalkiaL. Denm-iiark. Fratncc (Jer-nman\. Grcat r3tit.ain Holllan. Isri.It.l\ J Ipa. on11 l. RuIS Spa1I) Lin.Sw eden. Sw itzerklnd. TUrkc aind theUtniteci States-hoth to share thei- idte.asand to establish those personal contaictsw hich are sO imPorta-Int in bringilng0 aLbon1ian exchange ot informiation. The open-illn me1cetillnc was held in in impressi\asscsienly iroomi in the city hall and .isfollows dby a visit to the DisptILac1ionPro incial. directls aIcross the sqULarc.

1Thc president aind secretary of thecongress we12 re. respectivelv. Jose Nlillas-V\allicrosa aIntd JLnan Vcir et ot the Uni-Velsit\ of BarcelonLa. The unlliersit\ \\alsthe sea,t of the congress. aind thc aICaL-deImnic papers werc preseited in its lec-tuire roomils. The papers w crc dividedinto long ones. which had been re-quLestedl. aind shor-t onies w-hich hadl beenofflere-d. Thlerre wrc six of the ftormier-aind innUimerable ot the laitter. P'rintedtcopies ot the longer papers and printedrCsumes of the shorter- ones sere distrib-uitcd to the iembnierel-s ais the completcdtheir recistraltioll.

The first of the long papers was rcadon the afternoon of the opening day hbNI illas-Vlilicrosa. who dIiscussedl the re-kltions bet\vecun oriental and occidentalsciCeIce. ThreemC1oreC of the long paperssserc presenitedc oni the sLucceCeding. thilreemi-ornings. They dealt s ith the dlevelop-mient of science in medieval Europe.especililly in the 14th Lind 1 5th cein-tuiries: the rela-tionship bretss cen Amnicr-can aind Europelain science: .aind the dc-velopment of claLssical medicine andbiologv froii meledicsl to imoderin tillcs.The congress mosv cl to Madrid on 5Septemlllber. and the remainina t\so in-vited papers ws cre delivered there. Thesuilject of one was cartography. Theother ",,as concer-nied swith recent stuLdlieson the history of maithemaitics and phss-ics in EuIrope from the 16th centUrs tothe 8th centUry. Although these papersbore little relation to each other. thev,aill pointed either to the interrelation ofthe different sciences in their historicaldlevelopment or to the interaction be-tween the science ot one nation or oncCLiltuire aind that ot another. In one wavor ain other, each talk stressed the con-tinuity of scientific development.

The 10-minute papers covered a vervwide field and were grouped intosessions dealing with the history otttechnology and applied science; the his-torv of chenmistry and pharmacy; the

SCIENCE. VOL. 131

The Beginnings of Embryonic DevelopmentAAAS Symposium Volume No. 48 1957

Edited by Albert Tyler, California Instittte of TechnologyR. C. von Borstel, Oak Ridge National Laboratory

Charles B. Metz, The Florida State University6 x 9 incles, 408 pages. 132 ilIuStrations, references,

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A symIposiumn on "Formtition and Early Development of thc Em-bryo", hlelcd 27 December 1955, at the Secondi Atl.anta Meeting ofthe AAAS, scrvcd as the basis for this VOlILum. EImlphasis swas placedon the problcmis of early developmient and of the initiation of de-velopmenit. T'hc investigations prescnted in the various commnnunica-tions covcr both dcscriptive and experimential work on the biologicaland chemical lcvcls. Apart from their intr-insic interest atntd themeasure of progress that thcy provide, the specific discoverics andanalyses presented serve to exemplify various approaches towardthe understanding, of the manner in which sperim and egg contr-iveto produce a new individual.

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history of mathematics, physics. -andastronomi:; and the historv of geographydIndl geolog\. There xwas. in addition. acatch-all session f'or papers not clearlywi thin the subject area of one of theother div isions. The verv large nIlUmberot' these shorter papers bears v itness tothe world-xw ide ,ro\\ th ot i nterest in thehistorv ot science and to the increasein the nIlUmber of indixiduLaIls trained asspecialists in this field. Hoxxeer, havingso many papers schedLIledi for these ses-siobs made it necessary to dixvide somieot' the grouipsS ait the last mlintite. Thus,l'or example. it was imipossible for thephy sicists to hear the papers of theirMcllaguies in astronomx, and vice versa.I-his WaIs Unfortunate becaLuse. as those-it the con cress so well knew, the historyof science is not a history of the de-elopment of the separate sciences bLutULst lbe based on the concuirreint de-elopment of these scienlces and theircontributions to each other.A number of papers correctedt or am-

plified previous a1sSulmlption-ls bv histor-anris and bore xxitness to the hiTh caliberof the scholarship representted and to thet;act that the historv of sciciece is beinariewritten in the light of recenit research.[he dliscLussions which folloxxccl the talkswere livelv and sHignificallt.The genial, hospitalble Spanish hosts

prox dbiccl nuIlimerroLus opportunities forSight-seeing and social g;atherings. InBarcelonal there xxas ,A visit to the navalIIILISCLtIIl, a reception at the Spuuui.li Vill-(Ie.a x isit to the Acalnivde of Mleclicine

incl SuIeryCl\ andl to the 13iblioteca Cen-tral across the courtxIV-da aid an cXCLir-lOiil fromil Barcelona to Nlasnonl and the

II uLSCLuiI of pharmacology at the LIlbora -torios ciel Norte dc EspaCna. In Maclrid.there xwere opportuinities to see thenax al 1iiLuseLilml .and the Pral,da, w hichmanv of the particiliants in the Con--ress rexisited sexveral timlles.

-I-he final mieetillng Was heldc 7 Septcm-ber at the Escorial near Mlacdril. A mna-niificeint lunlicheoni xwas serxdcl at a lhotelon the hill overlooking the monastery.Ihere the George Sarton medal wasaxx'ircdecl by Henry GUerlac, presidentof the Historv of Science Society, to\lexandlre Kox re, eminent scholar of6th- and I 7th-centurl physics and

astronon, xwho divides his timie betxweenthe Sorlbonne and the Institute for Acl-a.ncecl StUIV at Princeton. At this

luIncheoll it xxwas announced that theinext International Congress of the His-tory of ScienIce x ill he held in theUnited States, at Cornell Universitv, in1 962. The invitation had been issuedand acceptedl at a meeting in Barcelonaof the g,eneral assemblx ot the Divisionotf the Historv of Science of the Inter-national Union of the History and Phi-losophy of Science. The conaresses area responsibilitx of the clixision. althoughthe actual task ot organiin, g and run-5 FF-BRUARY 1960

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in. ALKALINEPHOSPHATASE (BACTERIAL)A phosphomonoesterase with a pH optimumof 8.0 ond an unusual thermal stability.This highly purified enzyme is preparedby methods based on the following work:1. Torriani, A. Biochimica et

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1. Scott, E.M. and Jacoby, W. B.,National Institute of Arthritis andMetabolic Diseases. Journal ofBiological Chemistry, 234, No. 4,932 (11959)

2. Jacoby, W. B. and Scott, E. M.,Journal of Biological Chemistry, 234,No. 4, 937 11959)

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364

nling thenii is lef't to the host niations.The disvision has alIso Set LIP linternaLtionalICutititiittees to S t LiCVthe teaching ot thehistory of scienice. to catalog scientificinistrumiients of' historical importance.aind to e\ammi e or mlaintain 1h1131ioira-phicail and doCUmentatrs serv ices. TheUnitedl Staltes adcherecs to the Unionithrougi(h the Naltionall Acaidemsv of Sci-enices-National Research C OLInCII, Llhlder wshose auLSpIiceS the Unitedt StatesNatIona'I Comiiilttee for the IfnternaLttional Unilon of the History and Philoso-phy of Science has been established.[he other di\vision of the Unilon is tha,tof the Philosophy ot) Scienice.

During the COLurse of the congressthere wsere two mieetings of thait especi-al1v distinguished hodv knoswn ais theAcade1mie Internaitionale d'Histoire desScienices. At the secondc meeting H-enrvGuerlac ss as electedi presidlent, to SLIC-ceed \Vasco RZonchi of Ita,lv.

4f he Unitedi States delega"tes to thecongress ssere Henry GUerlac (chair-man). \Iarshaill ( I'ag,et t. I. Bernardi-cCohen, C. Doris Hellnman, Harrv WNoolf('alternate), land Dua'lne Roller (alternaite).

C. DoRus Ht H\t-mNUI.S. NVainitd Comnuiitiuie, for theIiiteriiilioitd(iUnionl of tlie His tory-ai/id Phil o,p/v of Sc-iecwe,Nno(ittil Acendemiv of/ S'cienCeS-N(WmiOl(/ Resea(I1hi Coitll(iil,VV$ishbi;totvn D.C.

Forthcominig Events

MIardil

2-4. Loss and Med(itin Fnergy NuclearPhsysics, colloquium.iii Gr-enoble, Fr-ance.(F. Netter., C .F.N.. Sa'cla\. BP. No. 2,Gif` Sin-NsVciteC. S~CHIC Ci Oise. Ftrmice.)

3 .5. American Aca,d. of Forensic Sci-ences, Chica'to. Ill. ANW. J. R. C.nmp.AAFS. 1853 WV. Polk St.. Chlicgo 12.)

3 .Assocititioti of' C linicall Scientists.Albainv, N.Y. 1R. P. M-icFlte, 3'3 North-swood Rd., Risers~ide. 111.1

4-0. Nlational Wildlife Federation. D)al-las, Tex. ((C. f-I. ( allison. 2312 Caiiroll St..NW, Wlashine-ton 12.)

61.Atiic can Oiorhinoloje-ic Soc. forPlaStic SL1rizet sV. tiam,111 Bach,CI I-1 ia. (.1. C.Gilbert. 7-5 Bairberrv Lane. Rosvl\n I ci'hts.

7-9. Wilcidliec N\Linaee,ment Inst.. Dalla-s.T ex. (C. IR. GHtcMuth.,01 709 Wit c Bid(l..XXa-,hine-totn 5.)

7i1. \mneticanm Soc. of' Civi FmIninccrs,Ness Otrleans. Ela. (F. S. Kitrkpa,irick,ASCF. 3.3 XW. 39 St., Ness Yoik (8.1

10. RZecetit Dces lopnmcnts it] PoutilryNultritiOnl \ssoc. of Vitamin C hemiisis).

Chcgo. Ml. (J. "F. S'irne. Direcctot- ol, Resea,rch. 1 s atpotatcd Mlilk \,ssoc.. 228 N.La Salle St., C hicago 1.)

10 11. Institutet of the ACt otiatiicil1 Sc:-ences Flight Propulsionn C Ileso],eaid Oh~nIo.I(S. tP. Johnston, 2 F. 64 Si.. Ness Y"oik 21.)

/3 /4. Atiierican1 Otolo(~cicl Seic..Miarni Belachi. FIla. IL. IR Boics, L nisversitvHospital, Minneapolis 14.)

14-16. Ametc -can Railwvay EngineeringAssoc.. aninua,l consv., C hicag,o. Ill. IN,. t).Hossatid. A\REA, 59 L. Vatn BI3Irti St..Chicigo 5.)

14 17~. Positisve Heallthi of Oldtet People.forLum, Mliatiii Bea,ch. Fla. I(A. NIallakch.N:ttiomiil Health COLtticiI, 790 rodsaNess Yor-k 19.)

14 18. Natiot.ial Ass,oc. of C orriosioti [ti-gincers, 6th ,Atiinal.d Da-lla~.", Tesx. (W. A.Ntlaplcr. N.XC F. 8263 XV. MtcNicholsRd.. Delitoit 19. Mi1ch.)

/ i 16. mnericatn Btrortcho[sophain-ological Assoc.. M1,iami Beach. Fla. (F. .1PLitt Vs 7 121 LOCLisi St.. Phil ade phKa 3.)

1-5-21. Notidesttructisve Testing. 3rd iti-terti. cotif.. Tokyo atid Osaka. Japan. (S.Ishizaika. Scientific Attaeche. F mbassv ofJapti111. 25 14 Ma,ssachusetts Asve.. NW1.W1ashitieton 8.)

16 18. Getictics Soc. of Canadka. 5th anitIILtal. VatiCOLnser. B.C. Miss K. C ole, Dcpiof Biologsv and Botatvs. Utiis,,. of Brit is))C o1,1t1i1ia. Vatliconser 8.)

/7. Con'tress, t'ot Pliat tiacists. 2rid an-tnual.Itiaa. N.Y. IC otigress for PThatitiia1CIStS. Public Rela:t1ionS Oflice. St. JohntsUtiis.. Jatli,iaica 32.)

17 19. AtmericatnRdni SOC.. COtif.Sati Jtit:tt. Pitetrto Rilco. A\RS. 635 Fas,t[itiloti3.iPsa,det.ia. Cal if.

17-19. Blood 131aitclcts. [intetrtII. ssynp.hv irisv: it]itiolsik. D)etrotOi. Mich Miss111

S. A. Johntsoti. FHetity Fot d Hospiltal. Dc-tr-oit 2.1

17 -20. nticrtiationa ~\ssoc. for- DetntalResearch. C hicaci(o. Ill. ID. Y. Bur)it--l.Norihs\ estcrti Usv. Dcnt.ial Schiool. 31F. Chlicaeo Ave.. Chicago 11.)

1 19( Aiieiricati ri-igsnological Assoc..Mianii Blea,ch. FlaII. L. Richairds. M:t'ssa-cliuisctis Itnst. of Technrologys. Canibridge.)

21() 23. Atierican A\ssoc. of' DentatlSchools. C11 le0i'n Ill. (I SitII Crt. 840 N.Lake Shiot- Dr)isve. ( hicaio I 1.1

20 >0. A\tiiricati Coti,,. oit Sitrvesvincaridi NLappiti'. XVashlitieton. D.C. IC. FPalltiitr. Atieticaticl11 Soc. of PhotoueratilIIIeit sv. 51 5 Ma~ss,ichttsetts Ave.. NW'.Wash itgton 1.

2>-26.A*,nicricati Soc. of Photogtrmi-mircvs. XVN:isli:neion. D.C. IC. F. Palmier.,\SP 5 5 'NLi:ssticlittise Itts v.. N"VXWashiititotn 5.)

1I 24. Atiicrictin A\cad of GeteietaPt aictice. 12~lth t tu PlliildCl phi:t. Pa1I\.AGP1. Volker Blsd. .it Brookside. IKamisais C its 12". M o.)

2 124. I tisti itct of Radio Frtigiinetrs.na,itl cons.. 'Ness Ys ork. N.Y. (I Gi CL1u1nniiti'. IREF. F. 79 St.. Ness Y(irk- 1I.)

22 i-4. Fiu-IihPols mer Phvssics~. 201th. D)ett oil. NlIcli. IT. L. Stiiilth, Americati Physte,al Soc.. Statmfotrd Research Itist.. Menlo)PRirk. Catlif.)

23325) N 'itiotial Cotitticil oni Alcoliol istii.,intinail. Ness York. NtY. IX,I. RZoss. Amr-icart Pssychiiiric Assoc.. 1701) 8 Si., NW,XVashliintoni 9.1

23-25 Optical Specti-otiiectt ic Nicaisuitcmienis of High Tctiipet attires. ssvup.. C Iii-caL,o. Ill. IF. Brech. La-boratotrics for Ap-pliedi Scieiice. Unis. of' Chlciicao. 6220) S.Drex.el Ave.. ChIic,ic:'o 3)7,

I34 25. HittII tIFc toIrsiI' intI cct rotitics1St ann1Itl1 sstip. IIRF). Ness York. N.Y.II FI. K:t liii. Bell Tel epliotie La liorattories-~MittrasHill. N.J.)

24 26. American ,Assoc. lor- the UHistors1,

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of Medicine, Charleston, S.C. (J. B. Blake,c/o Smithsonian Institution, Washington25.)

24-26. Aviation Education, 4th natl.conf., Denver, Colo. (W. Kinkley, Super-intendent of Schools, Aurora, Colo.)

26-27. American Psychosomatic Soc.,17th annual, Montreal, Canada. (E. D.Wittkower, APS, 265 Nassau Rd., Roose-velt, N.Y.)

28-31. Exploitation of Natural AnimalPopulations, symp., Du-rham. England.(E. D. Le Cren, British Ecological Soc.,The Ferry House, Ambleside, Westmor-land, England.)

29-31. American Power Conf., 22ndannual, Chicago, Ill. (R. A. Budenholzer,Mechanical Engineering Dept., IllinoisInst. of Technology, 3300 Federal St.,Chicago 16.)

29-2. National Science Teachers Assoc.,8th annual conv., Kansas City, Mo. (MissM. R. Broom. NSTA. National EducationAssoc., 1201 16 St., NW, Washington 4.)

30-31. Adrenergic Mechanisms, CibaFoftndation symp. (by invitation only),London, England. (G. E. W. Wolsten-holme, Ciba Foundation, 41 Portland P1.,London, W.l, England.)

31-1. Continuous Culture of Micro-organisms, symp., London, England. (R.Elsworth, c/o Ministry of Supply, Micro-biological Research Establishment, Por-ton, Salisbury, Wilts., England.)

31-2. American GastroenterologicalAssoc., New Orleans, La. (W. Volwiler,Dept. of Medicine, Univ. of Washington,Seattle.)

April

1-3. American Soc. of Internal Medi-cine, San Francisco, Calif. (R. L. Richards,350 Post St., San Francisco 8.)

1-3. American Soc. for the Study ofSterility, Cincinnati, Ohio (H. H. Thomas,920 S. 19 St., Birmingham 5, Ala.)

1-4. Bahamas Medical Conf., Nassau.(B. L. Frank, P.O. Box 4037, Fort Lauder-dale, Fla.)

2. Paleontological Research Institution,Ithaca, N.Y. (Miss R. S. Harris, 126Kelvin P1., Ithaca.)

2-6. American College of Obstetricsand Gynecologists, Cincinnati, Ohio. (D. F.Richardson, 79 W. Monroe St., Chicago 3,Ill.)

3-6. American Surgical Assoc., WhiteSulphur Springs, W.Va. (W. A. Altemeier,Cincinnati General Hospital, Cincinnati,Ohio.)

3-7. International Anesthesia ResearchSoc., Washington, D.C. (A. W. Friend,E. 107 St. and Park Lane, Cleveland 6,Ohio.)

3-8. Nuclear Cong., New York, N.Y.(P. Lange, Engineers Joint Council, 29 W.39 St., New York.)

4-6. American Inst. of Electrical Engi-neers, Houston, Tex. (N. S. Hibsham,AIEE, 145 N. High St., Columbus 15,Ohio.)

4-6. American Inst. of Mining, Metal-lurgical and Petroleum Engineers (43rdNatl. Open Hearth Steel Conf. and BlastFurnace, Coke Oven and Raw MaterialsConf.), Chicago, Ill. (E. 0. Kirkendall,AIME, 29 W. 39 St., New York 18.)(See issue of 15 Janiuary for comprehensive list)

366

New ProductsThe information reported here is obtained fronm

mantufacturers and front other sources consideredto be reliable. Neither Science nor the writer a.s-sumies responsibility for the accuracy of the in-formationi. All inquiries concerning itemns listedshould be addressed to the manufacturer. In-clude the department number in your inquiry.

* RECORDING PYROMETER measuresbrightness temperature at 0.65M of smallincandescent samples in the range 13000to 3000°C. Accuracy is said to be±20°C. The instrument consists of anoptical system with objective lens, beamsplitter, monocnromatic filter, and eye-piece. The eyepiece is used for align-ment and focusing. Seventy percent ofthe light is deflected by the beam splitterto a phototube. Time constant is limitedonly by the recorder or indicator used.A calibration curve relates output volt-age to temperature. Focusing range is40 to 70 in. At 50 in. the pyrometermeasures the average temperature of anarea 3/8 in. in diameter. (Avco Corpora-tion, Dept. Sci332, 201 Lowell St..Wilmington. Mass.)

* DIGITAL MILLIVOLTMETER is a port-able instrument weighing 23 lb. andmeasuring 93/4 by 10-5/16 by 16-5/32in. Ranges are 1, 10, and 100 mv fullscale. Accuracy is said to be ±0.1 per-cent. The self-contained instrument in-cludes instrument power, standard cell.ratiometer, bridge balance, millivolt-meter, and voltage-level and end-pointoffset controls. (Technical IndustriesCorp., Dept. Sci337, 39 North FairOaks, Pasadena, Calif.)* MAGNETRON PULSE MODULATOR iScapable of powering small magnetronsrequiring inputs up to 10 kw peak ata duty cycle up to 0.002. Pulse widthsfrom 0.1 to 2 /sec can be supplied.Pulse voltage, average magnetron cur-rent, and magnetron filament currentare metered. (Bomac Laboratories, Inc..Dept. Sci3 39, 1 Salem Rd., Beverly,Mass.)

* PLATINUM RESISTANCE THERMOME-TER covers the range -100° to +500'F.Resistance is 470 ohm at 32°F, andthe coefficient is I ohm/F°. The sen-sitive element, measuring 0.156 in. indiameter by 0.281 in. long, is pottedin a stainless-steel case. Calibration ac-curacies of +0.25, ±0.5, and +1 per-cent are available. (Minco Products.Inc., Dept Sci340, 740 WashingtonAve., North, Minneapolis 1, Minn.)

* VIBRATION TESTING SYSTEM is a ran-dom and sine-wave testing system forthe range 5 to 10,000 cy/sec. No im-pedance changing or manual power-factor correction is required over thisrange. Peak random force is 2500 lband sine-wave vector force is 1500 lbwhen used with the manufacturer's

SCIENCE, VOL. 131

CHROMATOGRAPHYDRYING OVEN

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sheets simultaneously

M[odcl CO- 1 is a tlhermiiostatically conltirolkl(ld i11-I1iIt(d 0( (11o S iCl (l I( i 1(ty1h( Ittiii)( I a t111 Cs

-tI) to 10)0) C.. \chliCT CXCVtlation ol so1 COlt \v11)orsws itlh watel O1 Iliotor asplirator. Heatilng cleiiiciits(O( CAtle(l iii b)sCe are pliotected(l froiii0 o11 u)tlstib)leCsolv (elt (trO)lCts. FI ca v ilCtltl-rcoil fo sc(l,slt t'- 1ss (lo00 rICa1(dilX pe-'rm1its 01)5(1o s 110tio of (olor (lC-VCyO)Inclilt wlitliotit rCl)CatCd Ol)ciiin of (1OO1. Stai-less stcci OXvcii Ch1amberl)Ci1 is OllOSOi-rCsistAnit.

Overall Dimensions: 27" wide; 37" high; 151/2" deep

UNCONDITIONAL 1 YEAR WARRANTY

Write for Catalog CD-25S

NEW BRUNSWICK SCIENTIFIC CO., INC.

P.O. BOX 606, NEW BRUNSWICK, NEW JERSEY

PHOTOMICROGRAPHYAcceurate tdetermijnation tof exposure ttime i;nblaCk-and-white cand

Write for u'1ietOn #810 to

color photomicrographyPrc R$125|.00

7I:ii I::T :: I:

mm. *y* *.*

11'' *m ± -

V'dc4TRIPLE-BEAM BALANCE.Z/ih S1ate Se1I3am hc Pa#

Fast Accurate Weighing

W. M. WELCH SCIENTIFIC COMPANYDIVISION OF W. M. WELCH MANUFACTURING COMPANY

ESTABLISHED 18801515 Sedgwick Street, Dept. E, Chicago 10, Illinois, U.S.A.

I(tinufactuimri of Scac,nti!t; 1, tcctrul.is ail Labocutocy Aippai(i

- Corrosion-Resistant - Economical

Capacity 111 grams SENSITIVE TO

(201 grams using auxiliary weight) 0.01 grams or less

* Hard, Cobalite Knife Edges* Grooved Agate Bearings

* Patenited One-Piece Beam

* Stainless Steel Pan u'ith Retaining Rin

* Three Scales Easily Read at Eye-Level

* Silver-Gray Hanzmnerloid Finish

4030. TRIPLE-BEANMl BALANCE, High ance to increase weighini^g capacity fromForm. The balance is 13 inches lonig and liI grams to 201 grams. This weight is11 inches high. The pan is 4 inches in matched to the balance with whichi it isdiameter and remo- able, and the hanger to be used and shotild be ordered at theis 1012 inches high. Each, $27.50 same time as the balance. Each, $1.504031. AUXILIARY WEIGHT. For use 4030C. PLASTIC COVER, For No. 4030.on the 100-gram notch of No. 4030 Bal- Each, $1.60

ELRAY16 6

L

F-

5 FEBRUARY 1960 367

niocdel A- 74 shaker. Pows er Renerator.fielcd nd degaussing sIppNl. c\ cling Os-cillator, servo system, ind stop-startcoitrols are houLsed in a singIc consolewith the shaLker- external. (1 in:-AltccFlectronics. Inc., Dept. Sci343, C Lvet-CMits C alif.

* N LIlI-DF C TOR hLas llnpLit impncdanccof 4((0() ohm Lind vill proside hi-hsensltivitvxwith souirce resistances up[ toI(00 kohnl. C ircuitlr is dcesignieci to pro-idle maximum sensitis ity at the null

point and saturaltion on1 Ilaree sienals.Scrisitisities are 0( ' m\/nim up to 20kohm SOLIIuCC resistance0.v0/.3 " m

tromio 20 to 50 kohnm. 0.5 u v/ninm ftonm-0) to 00 kohn. Sensitiv its nma hevrictd over ai I to 1000 rangJe. Pctl od

. rtcs frIonm less thlan 2- sec aLt kohmto 4 sec at 100 kohm. Zero shilt isless thain 0.5 d ti/'hrafter I hr of ss armip. The guard circLuit connnects to the

shieldl otf a t o-condLIctorY inpLIt cable.(I cecds aItlnd Northrulp C'o.. Dept Sci 345,4907 Sten1ton Ave.- Philladelphia 44,a.1)

* T1M01 1 tNt VI\ltR operLation is basedon photoelectric nephelometry. Thechange of intensitv of scatter-edi lieJhtextending oser the enitire clottinereaction is automaticalIls recordcl. Todletcrminc prothrombin time, thernmo-

sta1ttedl thrombnoplastin contained in arnicrotLIle is placed in the instrimenit.The sample is blo n into the tube indthe recorder is started. The nummber otdtivisions bets cen start and cnd pointgis cs prothrombin timc dircctlv. TheinstrLinmenit s optical uInit aindt recot dcl-arc seplarate, prcI-ulittin uIseCOf the lattettot other pLIutOSs. ( P3hotovolt C o rp.DCpt. Sci352. 95 MIadison Av\e. NceY'ork I n, N. Y.)

* RI1C.G I,A It I.) )W)\ R SUPtLAFt tfol-heas d-dU ts apL)plica1tions re dlesienIdclto haLtdlle itpilt V oltaIgC uIp to I §5 kvsingle-phaisc or- threc- phisc 2 to 60()CV SCC. aIndI to t'L11 tliSfl OLItpuLlt citrr-cntto 100 m p. sintle-phasc. tw o-phasel. tIltrce-phase or d-c. Sv stcns ated csi Ctncd to nicet CuLStollci- specifica-tioIns. (1-easv -DLIty Flccti-ic C o., Dept.Sci 3 54\4lIMsaitkcC, \V'is.)

* [I \I R 1(CR)RNIOR simnultanc-ouISIV Ilolitolrs Lup to 100 poilts antldSOLulnis 1t allatIlrl w5hell any of the pointsreaches the tcmpcratLIrC Inldicated onits coIltrol dial. The audible aIlart1- mas-Ih tLlIrllCd of manuaLI111V hile an idcIcitifv inl- liht rcnlainls oil its lotng its tiletenpmrCtLire renlaills oIl nornlal. ActualtenlperatLlre at atny poiIlt ma, ibe de-terI-nifneed ly rotating tIle appropriateset-point dliall LIltil tIe i lictItlg liht

flashes on. Over-all aIccurracy is + 3 F.-I-he svstem is butilt up ot the requliredln lilmer of I 0-unit pallels. (Fischer- &Porter Co., Dept. Sci357, 303 Jacksoll-villc Rd., Hathoro. Pl. )

* BATrTFRY1R'CKS ;arc potted for shiockresistallce Lip to 2000 gralsa. TilepaLck-s collsist of rechllareable Ilickel-cadCnliunl brattersv cells. 13 LIsing a IlsIuIliIher of cells, the pack ca1t rbC CLIS-toill forImled to fill w halt is ot'tell coi-sidet-ed tdcLatd sllacc and to prosvide atnsvoltauce or cLirr Cllt Cl13.1Citt requlie-dc.(Cs lIltCll lldlClsttl-iCS. Ilc.. Dept. Sci 3 39.21 2 LDu-hanl Ase., NletuLchlell. N.J. )

* SPRAY'DFl)MILi\l Hl-1 NIN( L'LFI 1: N'I'SIlave a total t}lclilless ol ().) I to 0.0(1 5iln. 1I1CILICu1di baseC illsutlatioll 0.005 ill.aild top Ilsu1laltiol11laIld arl-Sioll protec-tioll 0.00(1 to 0.005 ill TIlC ilsUlatIM;llcoatilliz lrl-mal lI LISCCe Pf1-OVidIeS a1 di-cleCtt-ic str-CIlthl of 650t) so lts. Heatill,Cco;itillgs cTtl b1e applied directlv to ttleparit or to dletachable conetloneIlts. B3yatpplopriate nllaskmiilg, .l desiredatl -

rl;lelcillelit of' SCr-ioLis-paralle"l CirCuLitscati be had. ( Flectt ofilh1 I tic., Dent.Sci 358, 711 1( I.alLlrel Cmlvo011 Blvd.,Northl Hollv \s ood, C alif.)

JOSt-tU.A StF RNNti\onal.B,,B )rca of Staidards

368

GLASS ABSORPTIONCELLS made KLT

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

SPINNER FLASKS*SUSPENDED CELL CULTURE UNIT

for Biochemical & Quantitative Growth Studies

* Stridtlard illotl1 offered in 5 -izes, w it i-inclh or doul eif -nfti.

* :Milro :111d IirilRe ix n4 il-o av1ailab.

* FCotlln-il Tf Illli (1 )Imp ller

'}l'( i

SEND FOR LEAFLET SF-I

dcsest,, BELLCO GLASS INC.VINELAND. NEW JERSEY -PATS PENDING

SCIENCE, VOL. 131