FREEPRECIOUS HOURS OF YOUROWN TIME ARE FREEDBY BUYING "READY-MADES"LIKE THESE ...

Chloromethyl pivalate

Polybrene

Hexadimethrine bromide

p - Chlorophenylalanine

Oxotremorine

BSA, Bis - (trimethylsilyl) - acetamide

1- Adamantanamine hydrochloride

Hemicholinium- 3

Propanolol

Tremorine

5,5'- Dithiobis (2- nitrobenzoic acid)

1 - Aminopropionitrile fumarate

NinhydrinBefore youi synthesize anything,check with the 1967-68 Aldrichcatalog of over 9,000 organic chem-icals. We may have already donepart of your job for you. If youdon't have our time-saver catalogof "ready-mades," send in this cou-pon today!

__________________________

ALDRICHCHEMICAL CO., INC.

Dept. S., 2361 N. 30th St., Milwaukee, Wis. 53210

6-/4. HN dratlIic Research. 12th initcrin.COl2 .. Fo[t ( ohlliis. Colo. IN. NI. Yicvd-jc ich. Color ado State Ulliv., Foi-t Col-Iills)

7-(). nal tical Chemistry s'mnip.. Sack-X iC. (G.l.ltd. (T). H. Ci. NI chiel. C hecmii-i..ii In1st. of C ani Ia, I s Slaitel St.. Ot-t;m ,I 4

/ (1- /4. Amricican Soc. of Ps chosomaticI)entistr! and M edicine. Sht t inn iiitti.Montl GailnI ci.1 Canada. (1 'Nkolliiian,\I')\I. 21771 Seicnca St.. 1BfflIo.,N 't. )

I) / '. lllltiniiiatiig Engineering Soc.,co1t1.. Nioniti-Cil. Clnidi{;t. (AN. 1). tli.k-ic!. 1IFS. 34 F. 47 St.. Ncw\ Yoik 10017)

1 /./ (C hernetics. 5th interii. con --r.,Nl4nitm 13chziui. (Interinatiolall Assoc. for(C hr- lictics. I'1 Roe BHis c -NI 1rccflc. N

/ /-1. High Energy Accelerators, 6thtiet*ii .ini).. C,mf idr(c. ';LIv. (W\\ A\S1i1i,ciff. Cainibr idge Filcti-on Aiccelc a-

tI*r. 42_ (Otfdi St., Calnihri d 02,1 8)/I1-I. lnformationi Theorv Inst. of

1locctl`ical ;iiid Flectroillic 1neinocirs. ilitelii.s\ 1i1p.. Si ii Renio, It'Ld (1). Scii iII nIoPoi\technicInost.of Brookl\ii. 333 .IJiv St..Briooklkii. N.Y.)

/ /m>niiericaii Fislieries Soc.. 97timiniil iotiz..fI innito. ( anad. (iR. F. HIut-ton IF S. SL IitC 1040( V;1 itln oon11t 1 Id*.,15th m1d New Yior k A\C., NN\, \\ isi-

in lint(l. l).(0.1 W--2. Higih Temperature, 3rd intcriln.

!\r11 hI., \. 'iioni.,I C.ifi Iept.)(C . SitIfoid Reseaa-ch Inst., 337R* Clivcvood Avc.

I ciilI ) ); k C if. 9402 )/7 -23. Netiro-Genietics and(i Netiuro-

oplithlmInology) 2111i ito! ii. Coli-.. Mloni-relF.ll .Q1.. C anida. ( A. lBir heai. SectiioudC NeoiitoiO'i. Uni\V. of Nloiitrcai. MIon-

1- O1. A\ni icmn A\ssoc. of BotanicalC ar(denls andel Arboretums. FIliaitil. On-ti ito. C.aiititd. ( F. Wiidnimov er., I)cpt. ofl]oil iti..ilttiic'. Ne\m Nlo\xi.O StI,to F! jniL ti \ c t IC C \; I V )

/1 2(). Buo Teclinology. 'iid iuitor-i.svnip.. WV.ishintzhon, D.C. NI. FI. Sitiionls.MI I1S. 101M i.thi St.. NA\ WIN shiittoll.Il).C. _ ( )()()- )

'()J2' [t so of Radioacti e Isotopes inPharmacology. initeorni. cmif., Goncv.,Smm it/ci loid. (13. Giassoni. Sclhool ot NIcd-icine, Univ. of Genovi, 121 Gcn.iiv; 4)

24 2 7. Aimricrai lust. of ChemicalEniginieers aidmdN xicam IlSt. ot' ( hciniiclEn-'iz1icrs. joilit n,it,.. NMcico C it. (.1.HIiirvx. NICCE 345 F 47 St., NN. 'oi-k1(0(01 7 )

24 -3m). liiteortitional Akstronautical F-odCo FItion 1 t ainilI"IIConr1 ..l.il ! alIdoY It osiN'xI. ( imerican liust. of NcroonaLtI-Ii. .iii t'sti"InItics 1)2) Sixsloh v.Noxw 'York 1001)9)

11 1-9(). 5 lass SpectrometrN. in tel co.cOnI.NN'cst 13riiiui, Germniay. (Geschiatsstelledci Co.sol-i.chal't De sLItlCi C hnCill./I[1Ii voni Heo-r-rn Dr. W. Fi-itsclhe 1Frimk-I iN/lain.i, Postfach 9075. GeCimains)

2 0-2.. 13rohlemiis of Quiantitative IHiol-ogy of \Metabolism, interli. symp., floizo-ki. Ceiialin ( 0. Kinnoc. 13ioiloisclhci\nstalt H1l oioncl. Hel-oKionmd)

29 /. uInter national Soc. fr Comipre-- 1cilsieve NMedicine, aITiII.l tiitg., Cfli;I_Lgo,

111. (I4. C . aB.ttornlan1. ISf N\I '()' EHaste~St.. hot olo\r C.iiif. 94704)

3-DIRECTIONALHIGH RESOLUTION

PRIOR

MICRO-MANIPULATORS.~~~~~

%W::.- ...

Offering resolutions of0.0001"' in the vertical planeand 0.004" in the two hori-zontal planes, the Micro-manipulator has both coarseand vernier controls in all di-rections. Available acces-sories include Ball & SocketJoints and Ad just a bl eNeedle Holders.

Right or left hand unit completewith 3-D tool holder ........ $175

With magnetic base and ON-OFFslide switch ............ $200

Tilt Movement Unit, complete with3-D tool holder ... $200

Tilt Movement Unit, complete with3-D tool holder and magnetic base

$225

e r i c s o b o t k a)I(co mpany, inc.

110 Finn Ct, Farmingdale, N.Y. 11735 (516) 293-927?

S ('I NIlNC'E, VOL. 157

COMPANY

.

C T Y

5 T A T E

POSITION

z p

BOOKS RECEIVED

(Continued froatn page 916)

Arms Control and Disarmament: TheCritical Issues. James E. Dougherty. Cen-ter for Strategic Studies, GeorgetownUniv., Washington, D.C., 1966 (order fromRenaissance Editions, New York). 104pp. Paper, $2.

Aspects of Marine Zoology. Proceed-ings of a symposium (London), March1966. N. B. Marshall, Ed. AcademicPress, London, 1967. 280 pp. Illus. $14.Twelve papers.

Attitude, Ego-Involvement, and Change.Based on a symposium (University Park,Pa.), May 1966. Carolyn W. Sherif andMuzafer Sherif, Eds. Wiley, New York,1967. 328 pp. Illus. $9.75. Fourteenpapers.

Aurora and Airglow. Proceedings ofthe NATO Advanced Study Institute(Staffordshire, England), August 1966.Billy M. McCormac, Ed. Reinhold, NewYork, 1967. 697 pp. Illus. $28.50. Forty-seven papers.

Basic Principles of Molecular Genet-ics. Irwin H. Herskowitz. Little, Brown,Boston, 1967. 310 pp. Illus. Paper, $6.

Biochemistry of Some Foodborne Mi-crobial Toxins. Papers presented at theSymposium on Microbial Toxins (NewYork), September 1966. Richard I. Matelesand Gerald N. Wogan, Eds. M.I.T. Press,Cambridge, Mass., 1967. 183 pp. Illus.$7.50. Ten papers.

The Biological Basis of RadiationTherapy. Emanuel E. Schwartz, Ed. Lip-pincott, Philadelphia, 1966. 640 pp. Illus.$18.50.Biosynthesis of Small Molecules. Georges

N. Cohen, Harper and Row, New York,1967. 126 pp. Illus. Paper, $5.95.Campaigns against Hunger. E. C. Stak-

man, Richard Bradfield, and Paul C. Man-gelsdorf. Harvard Univ. Press, Cam-bridge, Mass., 1967. 346 pp. Illus. $7.50.A Catalogue and Reclassification of

the Neotropic Ichneumonidae. HenryTownes and Marjorie Townes. AmericanEntomological Institute, Ann Arbor, Mich.,1966. 371 pp. $11. Memoirs of the Ameri-can Entomological Institute, No. 8.

Chemical Kinetics. G. Pannetier andP. Souchay. Translated from the Frenchedition (Paris, 1964) by H. D. Gesser andH. H. Emond. Elsevier, New York, 1967.471 pp. Illus. $17.The Chemistry and Metabolism of Mi-

crobial Lipids. William M. O'Leary. World,Cleveland, 1967. 224 pp. Illus. $8.Chemistry in the Utiliiation of Wood.

R. H. Farmer. Pergamon, New York,1967. 201 pp. Illus. $6.College Chemistry. Harry H. Sisler,

C. A. VanderWerf, and Arthur W. David-son. Macmillan, New York, ed. 3, 1967.925 pp. Illus. $9.95.

College Chemistry: A Laboratory Man-ual. Clark E. Bricker. Harcourt, Brace,and World, New York, 1967. 203 pp.illus. Paper, $5.50.Colloquium and Late-Type Stars. Pro-

ceedings of a colloquium (Trieste), June1966. Margherita Hack, Ed. OsservatorioAstronomico, Trieste, 1967. 465 pp.

Illus. Paper. Fifty-one papers in Englishor French.

25 AUGUST 1967

STERILE OR CONTAMINATED?

TSI TAPEidentifies the condition!

Protect laboratory personnel from Before Autoclavngcontamination and assure STERILE

glassware for each test by followingthis simple procedure:

1. Place all glassware in basketmarked with TSI Tape.2. After glassware has been auto-

claved for 15 minutes at 250° F.,TSI Tape will show a color change STERILE STERILEindicating "STERILE." STERIL|E STERILE

3. Following use, anid before dis-

posing of danigerouts material, placeglassware in basket marked with a

new tape and autoclave. After Autoclaving

TSI is the only tape which shows a color change after 15 mintutes in theautoclave at 2500 F. TSI Tape leaves no sticky residue when removed.

See your laboratory or hospital supplier forTSI (Time Sterile Indicator) Tape.

= Jc a lo For samples and complete description write to:

PROFESSIONAL TAAPE CO., INC.

365 E Burlington Avenue 0 Riverside, Illinois 60O46

-m~~mm.=

If vou aa m-Stvn Ultra-Sensitivity, Except"g:aResolution, and U-snaheLe Quality-offXn`-;<I.e ein 1in features and the attractive price ot"'the NEW vrrmnDi MK-1 SPECTROFLUOROMETERSENSITIVITY-Full scale for 0.0001 ,ug quinine

sulfate / ml.RESOLUTION-1 m,A with standard gratings.COMPATIBLE-with most chart drive and X-Y

recorders and oscilloscopes.NEW COMPACTNESS AND MANY ACCESSORIES.

Direct inquiries to:

D'NiDI D OPTICAL CO., INC.COMMERCIAL PRODUCTS DIVISION535-sc So.5th Avenue, Mt. Vernon, N.Y. 10550(914) 668-9393/Cable Address: FOCIUS NY

973

lets you prepare

more slides, in less time,

with less fluid

This is the Shandon Cyto-Centrifuge. It employs a uniquecell concentrating and distributing technique that permitsyou to prepare a large quantity of microscope slides using asmaller amount of human blood plasma, synovial fluid, peri-toneal exudates, seminal fluid or other body fluids. Centrifu-gation and slide preparation are performed simultaneously.which eliminates prior centrifugation and saves you time.The Shandon Cyto-Centrifuge does not damage individual

cell structure. Also, processed slides can be rapidly scannedusing a preset high power objective without adjustment be-tween consecutive slides. $885.

Learn the full story on the Cyto-Centrifuge and other qualityscientific tools. Write to Shandon Scientific Company, Inc.,515 Broad St., Sewickley, Pa. 15143. (PittsbLurgh District)

(

Experimilenits in \Ioderin Geletics.CGcorce N. HLIdock. Wiley New- 'York1967. 10) pp. lIlirs. Iiper. 3*.9s.

Ex;perimiients in Plh sialc (IChemistriDldi 1P. SlhorimArker .ind C.i-t W'. Gi-Lind. M reCtiw-s[ill. xNew York. cd. 2.96. 50)0 pp. III ts. 59).9)5.IerroelectricitN. I nnito FI-til//o n11d \W

icrt ,|, Men1'. NorthFtl1lI),r!nd, \miter dim.lllIrr >ieretm t, 1\\ ilc% ). Nes Yor k. I9).29)' Ipp). JrLIS. \ 1 I.25. SetCiC, of Nlrrrr-o cils\rCeleeied ropitCs irt S;rlrd Stt

F ields TIeachimin Tets in General Ps% -

el1olo-.~~. Prrrrl I 1. FICrid. Scott. Fones~inlirir(, lens cs. Ill., 1967.2I ' pp. Pi.tpcr S-2.25n

FORTIRA1N' itithI Flriineerim,. \pplica-tionls. Dllrnetl I). N ICC r,\cr1. 'V Ilev' NCvY ork 1'),i7. 24() pp. hu,s. P';prpi.'56 os

1oind(lationls of Fducation. (Geot (ccKIIJlCl-. f 'J. tics. Ness\ or k. e(d. 2.I '6)694 . IIllIrs. 5X.8.

Fomidatiolls Of lM'I siCs. N I r-io0 BL itiSpi ricer\1 r .rc-1.t^7. Ness Nowr k 90)7.6 3pp1'. itIs. 14. Spr rier tiersinr N,rtiit ihrlorpisvr, v(fl. 10l.IFomiidaoins of Social I'siclNolog I ,1

sIi-n F Jorlcs rind 1-lrtoitld 13. Gcrarr d.\\ rle\ Nes N or I. i9()7. p,p. IlIr

(Glacier Bt!: Ihe1L:11(1 alld the SilHt1C.I)re Boihlnii. E.Isvi( 13r o I\cr, d. Siet'F

irIh. S, in I 'rII .l\)f 7. (6 pp. IlirtC i-c ;Seal, (omimIon Seal. rin r'cor i1n

(d tile lilf 1In (tot ics of Br iti]ll scil. RZ. N.skies1x DJoherl zllmttc. N'es Yirk. I)f67 pp.IIts. 's7.95. A Surir v al Rlook orr

T1ec Grow th of Kinows ledge: ReadinLsonj Oryanization and Retriei al of Infor-niationi. N,itnfired Koehern. Fdci. \,Vil\s,, Nes\

irk. 19(7. 412 plp. lrt1ws. `14.95> T\ent-i\ on r pilper-,

lIeIterocicdlic C(onipotinds.s . 8i. ITi'ii*/1 ,. / t/l-iii (dir , or I?( lhii( l li/br' .Sr.

.iris. Roer-t (C. (Id 1-eiCId. F d. WilesNess Yor . 1967. 47(1 pp. IlIn,S. <28.

Hminan Behav ior: Sliorter Edlition.et-itt d 1crB elsoll 111nd (It .\. Ste'ine

I iltreolnr. Rli itc. , ii( 'orld NewN or kI)967. 233 pp. IIILs. Piper, Y'.4(1.

An Illustrated Catalogue of the Roth'-childl( Collection of Nyceterihiidae (Dip-tera) in the IBritishi MuIIseuim (N atura1listory ). Oskit TIheordot h3r irish Mltsem(N.ItLi il lHistor 5). Iontdont. 1967. ft6 pr1

Infrared Spectroscopy in Surface (Chem-istrN. N1\I chfieil THItir. Dekkec r, Necs

it k. 1967. 3 Ipp 111 is,. 1 ". 7 .

1In(dex and Bibliography of Mlass Spec-Ironmetry. 1963-1965. 1 \\. Nicl rflfertsrildJ till h)iIIelrk. Inter cieree (\N'iles rNe\ Yr irk. 1967. LtJnpiredI. PIrprt SI2.

Inorganic CheniistrN. 1. T1. Strider'solltReiriholdl NCes Yor k I(67.6 4421 pp 1111i' 4. Reinihlold C lhcistr\ I c\tlhoolXk Setie-i.

1nterferomietrv. W'. II. Steel. Ctimtrhr idiLntiv. Press, Ness Yor k. 19(7. 28 1ppIiL,. .1 1.'I().Interpersonal St.les and Grouil) Develop-

melit: A11 Allalv.is of the A lenihier-

II eader Relattionslhip. Rcihl;trd D. NIrirn n.(r ,thriri S. Cilihhrld. ;l .omill . [h.1tintin. W ilev Ness Y itt k. 67)(7 320( plpI It 1,. X8.25.

Ilitrotltuctioii to llectron Spinm Resonanc.Fi. NI A\s",etnlrler. PICtirIrns Prcss, Ne\s

VOItL.1a') 15-

rnommolp-

York, 1967. 208 pp. Illus. $9.50. Mono-graphs on Electron Spin Resonance.

Introduction to Electronics. Lane K.Branson. Prentice-Hall, Englewood Cliffs,N.J., 1967. 614 pp. Illus. $12. Prentice-Hall Series in Electronic Technology.

Introduction to the Operational Calcu-lus. Lothar Berg. North-Holland, Amster-dam; Interscience (Wiley), New York,1967. 304 pp. IllIs. $12.

Is Anyone There? Isaac Isimov. Dou-bleday, Garden City, N.Y., 1967. 334 pp.$5.95. Thirty-seven speculative essays onthe known and unknown.

I. V. Kurchatov. I. N. Golovin. Atom-izdat, Moscow, 1967. 110 pp. Illus. Pa-per, $1.25.

Laboratory Experiments in Physiology.Blaine H. Levedahl and Albert A. Bar-ber. Mosby, St. Louis, ed. 7, 1967. 185pp. Illus. $3.95.A Laboratory Guide in Chemistry. Jo-

seph H. Roe. Mosby, St. Louis, ed. 5,1967. 270 pp. Illus. Paper, $3.95.Landmarks of the Western Heritage

Since 1500. C. Warren Hollister, Ed.Wiley, New York, 1967. 660 pp. Illus.Paper, $5.95; cloth, $8.95.

Large-Signal Transistor Circuits. DonaldT. Comer. Prentice-Hall, EnglewoodCliffs, N.J., 1967. 284 pp. Illus. $10.50.The Layman's Dictionary of Psychia-

try. James A. Brussel and George LaFond Cantzlaar. Barnes and Noble, NewYork, 1967. 283 pp. Paper, $1.95.The Liquid State. J. A. Pryde. Hillary

House, New York, 1967. 187 pp. Illus.$6.Magnetism and the Cosmos. N.A.T.O.

Advanced Study Institute (Newcastle uponTyne, England), April 1965. W. R. Hind-marsh, F. J. Lowes, P. H. Roberts, andS. K. Runcorn, Eds. Elsevier, New York,1967. 450 pp. Illus. $27.50. Thirty-eightpapers.The Management of Data Processing.

Richard G. Canning and Roger L. Sis-son. Wiley, New York, 1967. 136 pp.Illus. $6.95. Manager's Guide Series.A Manager's Guide to Computer

Processing. Roger L. Sisson and RichardG. Canning. Wiley, New York, 1967. 140pp. Illus. $6.95. Manager's Guide Series.

Mathematical Logic. Stephen ColeKleene. Wiley, New York, 1967. 414 pp.Illus. $10.95.

Medical World Annual. Compiled bythe Editors of Medical World News.McGraw- Hill, New York, 1967. 259 pp.Illus. $9.95.Milk Production in Developing Coun-

tries. R. 0. Whyte. Praeger, New York,1967. 240 pp. Illus. $10.

Missile Base Beneath the Sea: TheStory of Polaris. J. J. DiCerto. St. Mar-tin's Press, New York, 1967. 175 pp.Illus. $5.95.Modern Prestressed Concrete. H. Kent

Preston and Norman J. Sollenberger. Mc-Graw-Hill, New York, 1967. 349 pp.Illus. $13.50.Molecular Mechanisms of Temperature

Adiaptation. A symposium. AAAS Publi-cation No. 84. C. Ladd Prosser, Ed.AAAS, Washington, D.C., 1967. 398 pp.Illus. Members, $10.50; others, $12.50.Twenty papers.Mossbauer Effect Data Index 1958-

1965. Arthur H. Muir, Jr., Ken J. Ando,

25 AUGUST 1967

ALL-STAINLESS STEEL

REFRIGERA TED

CIRCULATORwith built-in compressor

Imagine . .. a refrigerated circulator with a built-incompressor, all-stainless steel system, and all solidstate electronic control for only $595.00! It takesjust 45 minutes to cool to minus 10°C (without load).

Since the all solid state electronic control withthyristor and printed circuit places a much smallerload on the thermoregulator, the life of the contactthermometer is increased by 300%. No lubricationis required-ever, as the pressure-type pump hasno bearings. And, because the flow-control valvecan be regulated manually from zero to maximumoutput, the risk of excess pressure with fragileglassware is completely eliminated.

The K-2/R is ideal for tenmpering spectrophoto-meters, refractometers, polarimeters, viscosimeters,and glassware. It's also ideal for use in bacteriology,microbiology, and other biological fields. For thecomplete K-2/R story. ask us for bulletin SBR-167.W-5783X Lauda Model K-2/R Refrigerated Circu-

lator, as illustrated, for operation on 115volts, 60 cycles, AC. Price ......................$595.00

OPERATING RANGE:-10° to +1500C

SENSITIVITY:0.0050C or better

CONTROL ACCURACY:±40.01 to +0.02°C

HEATER WATTAGE: 500 W

PUMPING CAPACITY(Zero Head ):

21/2 Gal/Min

MAXIMUM HEAD: 7 Ft.

RESERVOIR CAPACITY:1/2 -Gal.

COMPRESSOR: 1/6 HP

REFRIGERANT: F-12

BENCH SPACE REQUIRED:Only 19"xI21/2"

Branches: Boston 16 Danbury Elk Grove Village Fullerton Philadelphia 2 Silver Spring Syracuse 2Branches.Mass. Conn. Ill. Calif. Penna. Md. N.Y.977

ID

I -

FOR EVERY CRITICAL CLEANING NEEDIN LABORATORY OR HOSPITAL!

All BIODEGRADABLE!HI "S'I Bi 1-1 SI' foi- wetting pows iSCcjneStet inc pviws c and emnulsitlving cfi4 cct or all1 gcnct ii laboratoy hiospital.Iitc smurgkcil cIisswsateceqcuipmcnt mmn1Sintro1IItS. i'01pitopiicy Solublc inict

r insahic. PciIfC:c.. Iiillti aISOnIic WeaShici S

THE MASTER CLEANER

'' ting. \Iccts highiestgoscrnmniit specitic at ion's' Inl 3 lb.hosces, a rycl 2, 0()

11,hh)l. drumis. '

3 lb. BOX- $2.12'Case of 1 2 Boxes- $20.00

- p csvcnts w5ater spoittin ivitmn in,Iii rsc, fo~~ft~~ sicetitI. .aIlv cIcan glass,

I II lbt.. hoscs mcIn di on>ilas abose.5 lb. BOX-$3.00

Case of 6 Boxes-$15.00ALCOTABS

1 in) sVplllltt .Is'c Pipcttc and test tithe

tarhlct hoxc'.Box of 100 Tablets-$5.00

THE PERFECTLIQUID

DETERGENT!

Soft swa.tet. Outostanci

Ions, & mr (1.ditinS,PER QUART-$2.15

Case of 12 Quarts $19.92PER GALLON-$7.00

Case of 4 Gallons-$24.00All prices slightly higher West of Rockies.

R A FIIIIESKIN

CH1CA- CInNCINNATI 0 CLEVELANDI .TPOJ* HOUSTON * KANSAS CITY

LOS At GELES* HAYWARD, CAL.F- A TWA *BELTSVILLE, MD.

9-E j

an11d flelen NI. Coogani. Initciscrcnlcc (Wi-iev), Nc\s Ym-ok. 1967. 369 pp. IlIlns. 8-,9.

I-le Moynihant Report and the Ploli-tics of Controversv Lcc R,iinlw itcr alidW\V 1ii.n IL. Ytnk\ Nil.I.T Prcs. m-hi- d(cc \N.tss., 1 967. 5 pp l,o. PapfCt.,9sMtnltis atriate Statistics for 1'ersoiiiiel

(lassitication. Phillip .1. RIrIcin. DIlid VN-1 ic(clcm.in. NIjur1 icc: NI. itiowkt. m11d( hatiIcs R inrit \\ lcs :'\\ '1 Ik,

Negativ e ITaxes and( thie PoN erty Prob-lcm. Gh iiophi ( c BHi ook Iic Inliii io. a Ii nglori.D. 96.22 ppInII '. P Cie F {t: clot h. "N'eii M\ethods for Solvinjg IFIliptic

I (j1,l1atiollS. I. N. \Vchira. 1 1,nIla,itCd tint11thcIe kIii InK, II ). F Hios A. B3 I iIci., T,1,nI,litiiii IFc. Novtht -Hllmid. A\stci-dim1: lIntctsc;cnicc (W\j\lc Nc\\ Yw.kl1 967. 4)1 pp. s,16. N orth -HolLand Scri-c,Anpplied \I.itciii,mtilcs mid MIc:h;inm.

Nonlinelar Programnming. J1..\hAdioc FJ.lNorth IHolLind. A,\n eistcrcmn: 1n1ct ,,Ic0CM(

'1c\ I. Ncsw tk 967. 33S' pp. IlluiF1.1OiHttccn papcr-s.Omres Mtatheniatiques. Raph.p 8.C-

cmii. Hci mmin. Pat is. 1967. 64z pp 9(4 1Ontogeny of' Immuiinit,% Pi-occ~:dMin ofi

hc sccond Dc'vclopmntcn ti I minmlioir-Wm-k,hiip (Sanihcel Ik ,indl. 1 -IaII ch)in in1

airv 1966. Spons,ot-cd hi-N,in1 Insti-lteot (it ilbd H-cadth ,nld Hu-inin D)c\chp-nIlcnIIt. R IC1II,i d.1cT. 'nIIIth. 1' obi \. C1 od.md- Pctci- A. Niics,chci-. d 1. Ks HI' oniddm Pi-cs".Ciic"iIcii(67. 222

Operations Research in Sellers (omin-petition. A stochaistic nikH othciv S.Sank.mr Sco cupta. \\ Hle N\%Ys'i k.1 (J246 pp). WIn .9. 9'7

Order and Change: 1Fssan s in (omis rar-tiiCcSociologs ii hc ii I. NI ntc \\Ic\Ncss Yo i-k. 1967. 323 pp. \KIh~.9_

Pen-guin 1Technologp Sirse) 1 967. Ai

m 1.I907. 2147 pp. h1ut ci81Personalitv Measuiremenit: Ani Introdotc-

1-IonicWsnd. I11.. 967 47 pp. lIItii(4(1(4 D(ot-sc\ Sci ics Inll ilcPerspectives and Principles for PhlmNsi-

cal IdAimeation. Ji.m ct I ckh iii. NV11icS. N c .

Yort-k. 1 67. 24 pp. 8."Phli sics and Clheniistrr o)f II-N I Comni

pounl(ls. NI. A\ cii oild 1. S. Pt1coct I I'.NowtIii AI]i iiii. AXiii clo,ilcIWlnici'tn.(W] Ic Y.Nv'o k.I Qi6 862 pp lII LI

I-lie I'lsr siograph'% of Arctic Canadai.XXiii pccimi cl-ci:cii to hcinc..itl

ot P-ci is Chiatmicl. 1. Br iii Bit c. J olinl-lokin. Pic1. ,ilttimoi-c. i967. >(6 pp.lt .

IPlanit-XNater Relationships. R ( SiS ci. \c,clciiiicPi css. cvS.\ t6.

I8ppX)-). 111crU.. 816(.-i I \pt1ICitIIt,1 IiatiV inn I1tilcilntiot-itid i,c;ill Nion

Potter's LlaboratorN Ouitlinie for Genser-

by, St. Louis,. cd. 6. 1 967. 255 pp-. 111cr'.

Josephi Priestley: Revolutions of thecEighiteentli C'entumry. IF. WX. Gibbs. IntlcIlav C-Iii dIcii C it N.Ys.. 1 967. 2")() pp.hluts '0.4

Have you

checked

or

newvproducts

Check your needs an-d

ask for additional

information anld prices.

ULTRA PURES FOR RESEARCH

These produicts are, 'mithout exceptioncf the highest quality and PLuritycomrmercmaliy availabie.

EAMMONIUM AMMONIUM

ACETATE, SULFATE,Ultra PLmre, M.A.Heavv Metals (as Ptb Heavy Metals

0.0001IC (as Pb)Iron (Fe) < 0.000 1 0

.0.00005

Calcium (Ca) 'SUCROSE-

0.00004c1 DENSITY

MAagnesiumi (M'g GRADIENT

0.000005 c GRADE. M.A.Arsenic (As) Nct IRNase Free)

detectabler- TRIS, Ultra Pure,

AMMONIUM M.A.FLUORIDE, (previouisly calledUltra Pure, M. A. "Enzyme Grade")Iron (Fe) lbli 0.01 PPM

,0.00005 c CLu 0.02 PPM

Chlori'de (Cl) Fe 0.2 PPM

0.0005 C

Sulfate (SO-,--0 .00055

Arsenic (As) Nctdetectable

7iUREA, UltraPure, M.A.Fe-Notdetectable

FREE WORKING SAMPLES OF THE ABOVEULTRA PURES ARE AVAILABLE UPONREQUEST.

ANTI-CANCER AGENTSFor Studies into Mammary, Ovarian,Pulmonary and Stomach Cancer as wellas Hodgkin's Disease

27 N,N-DIHYDROXYUIREA

27HYDROXYUREA

TETRANITROMETHANE (TNM)Recent studies have indicated Tetranitro-miethane shows promise as a highly selec-tive, specific and mild reagent for thenitration of tyrosyl residues of protein atpH S. To encourage further investigationMANN RESEARCH can now offer TNM asfol lows.TETRANITROMETHANE (TN MlM.W 196.04B.P. 125.7 CJl P. liv C.CaUtion: TNrtl is relatively insensitive toimpact or adiabatic compression hut mix-tures with other organic materials mustbe~checked tor ease of detonail'tiiy andhandled .s ith appropriate caution.

FREE CATALOG -

lists over 4.000 researchbiochemicals. A must for,your files. Call or writetor your copy today.

MANN RESEARCHLABORATORIES, INC.

a B ED company135 Liberty Street, New York, N.Y. 10006

(21 2)-233-5863

SCIENCF. Vo7t)_

L

Principles and Applications of WaterChemistry. Proceedings of the FourthRudolfs Research Conference (New Bruns-wick. N.J.). Samuel D. Faust and Jo-seph V. Hunter, Eds. Wiley, New York,1967. 659 pp. Illus. $12.50. Twenty-threepapers.

Progress in High Temperature Physicsand Chemistry. vol. 1. Carl A. Rouse, Ed.Pergamon. New York, 1967. 248 pp.11,,',. $I 1.50Prothromhbii in Eiizyiniology, Thromii-

bosis and Hemophilia. Walter H. See-gers. Thoma.s, Springfield, Ill., 1967. 199pp. lllus. $9.75.

Psychoanalytic Techniques. A ha.nd-book for the practicing psychoanalyst.l3enjamin B. WVolman, Ed. Basic Books,New York, 1967. 606 pp. $15. Twentypapers.

Psychology and Life. Floyd L. RuLch.Scott, Foresma-n, Glenview, Ill., br-ief ed.7. 1967. 616 pp. Illus. Paper, $5.50;cloth, $6.50.

Race aind Racism: A Comparative Pler-spective. Pierre L. van den Berghe. Wiley,New York, 1967. 181 pp. Illus. $4.95.

Radiology as an Art and Other Essays..1ohn 1 McClenahaln. Thomas, Spring-field, 111., 1967. 101 pp. Illus. $5.75.

Reaction Index of Organic Syntheses.Shigehiko Stlgasaw.a and Seijiro Nakai.Hirokawa, Tokyo; Wiley, New York,1967. 257 pp. Illus. $8.75.Reagents for Organic Synthesis. Louis

F. Fieser and Ma-ry Fieser. Wiley, NewYork, 1967. 1469 pp. Illus. $27.50.The Rise and Development of West-

cri1 Civilization. vol. 2. John L. Stipp,Allen W. Dirrim, and C. Warren Hollis-ter. Wiley, New York, 1967. 738 pp.Illus. $8.95.Erwin Schroidinger: An Introduction to

His Writings. William T. Scott. Univ. ofMassachusetts Press, Amherst, 1967. 191pp. $6.50.

Science in Utopia: A Mighty Design.Nell Eurich. Harvard Univ. Press, Cam-bridge, Mass., 1967. 344 pp. $7.95.The Search for Understanding. Caryl

P. Haskins, Ed. Carnegie Institution,Washington, D.C., 1967. 354 pp. Illus.$6. Twenty-two selected writings of scien-tists of the Institution, published on the65th anniversary of the Institution's found-ing.

Set Theory for the Mathematician. JeanE. Rubin. Holden-Day, San Francisco,1967. 399 pp. Illus. $10.75.

Sharks, Skates, and Rays. A sympo-sium (Bimini, Bahamas), January-Febru-ary 1966. Perry W. Gilbert, Robert F.Mathewson, and David P. Rall, Eds.Johns Hopkins Press, Baltimore, 1967.640 pp. Illus. $15. Thirty-nine papers.A Short Course of Physical Chemis-

try. E. A. Moelwyn-Hughes. Elsevier,New York, 1967. 569 pp. Illus. $8.50.

Soil Biochemistry. A. Douglas McLar-en and George H. Peterson, Eds. Dekker,New York, 1967. 523 pp. Illus. $22.75.Seventeen papers.

Thin-Layer Chromatography. Justus G.Kirchner. Interscience (Wiley), New York,1967. 810 pp. Illus. $21.95. Techniqueof Organic Chemistry Series, vol. 12.Toward a Manpower Policy. Robert

Aaron Gordon. Wiley, New York, 1967.384 pp. Illus. $8.95.

_

But this one is.It's unique. It's the completely new Bendix' MA-1. It gives you both fastscan and high sensitivity. (How's that possible? It uses the new, exclusive,bakeable magnetic electron multiplier.) Yours, too: Simultaneous scope andrecorder readout.MA-1 is a complete system. Its 1-to-500 amu operating range permits

application in both organic and inorganic research. This means that for$10,500, you get a Time of Flight Mass Spectrometer that makes other low-cost models seem incomplete. With a 50,000 spectra-per-second oscilloscopescan rate. 1.5 seconds to 60 minutes recorder scan time for 2 to 200 amu.Resolution greater than 200. Mercury diffusion pump that gives operatingpressure below 10-5 torr and, with addition of liquid nitrogen trap, to 10-1torr. Stability of + 1 KZc per hour on a permanent gas peak. Analyzer assemblybakeable to 300°C.

You'll find MA-1 particularly useful for examining short duration samples.Gas chromatograph effluents, for example. Its basic inlet system is suitablefor direct sampling of volatile liquids and gasses, and for direct coupling togas chromatographs. Electronics? Table-top, integrated, solid state circuitsfor trouble-free performance and easy maintenance. For complete informationwrite: The Bendix Corporation, Scientific Instruments Division, 3625 Hauck Road,Cincinnati, Ohio 45241. Or phone (513) 772-1600.

25 AUGUST 1967 979

Whatyou want

in a rotatingflash

evaporator

... 4 e ..

'~ ~-t. .,."

tXh9

i..

I..

a/:

is one witha full complement

of modular,expandable

accessories!

Get it in a flash from Precision!Yes, that's exactly what you get withPrecision's all new and highly versatile lineof rotating thin-film evaporators! And, per-haps more important, high speed evaporationof solutions, even those with high boilingpoints or those containing heat-sensitivesolutes.

Starting with the basic unit, simply add a1,000 or 2,000 ml evaporating flask (standard24/40 joint)-then pick your preferred con-densing means-a spiral condenser, a DewarCondenser, or a flask. And there's a con-trolled heating bath for the evaporating flask.There is a fixed speed model operating at

120 rpm and a variable speed model, with a

solid state SCR speed controller, which main-tains high torque across its entire 30 to 250rpm range. All-glass-and-Teflont evaporat-ing system assures you of contamination-freeperformance. No chance of contamination inthe flask, either, as no O-Rings are used inthe sealed system.

Select only the module needed for yourcurrent application, with full assurance thatthe conveniently added accessories will bdimmediately available as your requirementschange. Complete information is in our Bulle-tin 653, ask your Precision Scientific Dealeror write us.

Index of Advertisers

25 August 1967

Aldrich Chemical Co . ........... 972American Optical Co . ............ 984

Bausch & Lomb ................

Beckman Instruments, Inc. .. 850,Bendix Corp., Scientific Instruments

Div. .. ....................

Blickman, S., Inc...............Buchler Instruments, Inc.........

967855

979863969

Cary Instruments ............. 857

Digital Equipment Corp...........Durst (USA) Inc., Photo TechnicalDiv.........................

865

871

Electro Scientific Industries Inc. .. 870

Farrand Optical Co., Inc .. 973Fisher Scientific Co . ............. 858

Gilford Instrument Laboratories, Inc. 983

Hacker, William J., & Co., Inc....Hewlett-Packard, Loveland Div.....Hewlett-Packard Co., Sanborn Div.

lIT Research Institute ............

Instrumentation Associates, Inc.....International Equipment Co.......

968861880

981969860

Klett Manufacturing Co., Inc .. 976

Lab Cages Inc. .................. 869Labindustries .................... 876Lea & Febiger .................. 968London Co. .................... 862

Mann Research Laboratories ......Manor Research ...............

Maryland Plastics, Inc............Matheson Scientific ..............

Mech-Tronics Nuclear Corp......Mettler Instrument Corp ........MSE Inc. ....................

978964877978876969866

Nalgene Labware Div. ............ 873N.J.E. Corp .... 970

Ohaus Scale Corp. ............... 981Olin Mathieson Chemical Corp. .... 854Olympus Corporation of America .. 859Orion Research, Inc. 875

Percival Refrigeration & Mfg. Co. ..

Philbrick Researches, Inc.........Phipps & Bird, Inc, ..............

Precision Scientific Co............Princeton Applied Research Corp. ..

Professional Tape Co., Inc........

Saunders, W. B., Co..............Scientific Glass Apparatus Co., Inc.Scientific Products, Div. of American

Hospital Supply Corp..........Shandon Scientific Co., Inc.......Siemens America Inc............Sigmamotor, Inc..Sobotka, Eric, Co., Inc...........

970878975980872973

851977

856974971976972

Tracerlab .... ....... 975TRW Instruments ............. 864

SCIENCE, VOL. 157

Since 1920 - The finest in Quality Laboratory Apparatus

SUBSIDIARY OF

SCIENTIFIC Co.GCACORPORATION

3737 W. Cortland Street, Chicago, Illinois 60647Local Offices in New York Chicago * Los Angeles

980