5
Announcing the New EA System for ELECTROPHORESIS EA-4 Power Control Supply Designed especially for electropho- resis. Continuously variable voltage 0 to 500 V. Stable: Supplies constant volt- age. (Ripple less than _- 0.1%. Unit regulates to 0.1°o.) Also can supply constant current over entire range. No variance in mA wvith change in load ' 900o. DoLble scale meter shovws V and mA. Exclusive built-in timer with auitomatic hshut-off. Four chiambers- SimliltancoLus operationi (7 tests [Der chamber). Constant cLirrent control over ecitire electIophoretic range. LEAH1 Eliectrophoresis Chamber High impact poly tyrene; water cooling jacket. Dumed see-through lid. Safety interlock. Platinum olectrodes run en- tire chamber length. Polarity reversing switch. Simple, accurate method of attaching sample strip with flexible holders in integral part of chamber unit. This system offers features and advan- tages never before found in electro- phoresis equipment. The design is su- perb-and the system was precision built by scientists expressly for scien- tists. 01ir free brochure will give you a full description complete with addi- tional pictures. FREE BROCHURE li____ ---I__ __ jMAIL COUPON TODAY!; Carl Schleicher & Schuell Co. Keene, New Hampshire-Dept. S-9-67 Please send free brochure on nevw S&S/EA System for Electrophoresis Name Company Address City State Zip 4 STOCKED BY: Van Waters & Rogers, Inc. Will Scientific, Inc. E. H Sargent & Co. but a basis f or real corrective aiction will have been obtained. Berkeley did not reach its PICSent positioIn by xvirtLne of pireferential treaLtmlent by federal agencies. If Ohio (and other states in similaIt- situLa'tion s) ldecides to dlisCarI-d her cornIfortlable svhippin, bos arid at- temiipt r-cal improvement, both Ohio anidi the 1naItion ill neilefit. 1. DF-RRAL MUI 1101n 1 \ND PmtN Otficc Bo-x 631, La Calnada, Calfiformiia 91011 Burgeoning ABNI Costs The Lanitbiallistic imlissile p ort im I, aoIut to receive aI $5-billion1 dosin pa menlit flrOllm OLII osl ernnotit. TIhis initial program may lbe expanided itito an estlimaLted S40 bIillion project. If so. the dar k fillnan1ciall clouId nIOW halng1`12ing oVer other goern iment progt-ams; MaV erove to be merely the begitinitin of a long' nigtht. I amii toldl that. in foreign Policy. ill othter- area.lS goenmcI-11enltal decisionls aire made by a riocess of aIccommodat- ino diverse and conflictirn, iterests. Scientists. ws hether pUIrC, applied, or intermediaIte. are combatailts in a lonn. unrelenIting wvar against poverty, imiis- !e dlisease, nid ign1oIrance. As `uIchI. wve have a legitimte vested interIest in ad ocalting foreign policies which telnd to keCep CxpCndCitures for nationral dle- fense s ithin realsonable limits. The sciClntific com uniLIllity needcs to dic- cide ss here it stlands onl CrUlciadl issu4es a>nd( then to apply presstirc in aippro- priatC pla1.ces. I sug1est an1 LIniased poll of the reLaIders of Scic,cc, or of s,ome othier sULitaIbl\ choseni popu1-flatioll. to dceter-miiine w hich issLes evoke som ie deCe1-CC of conISenIsLs. BsI{Uctt S. JsCottsoN- Radli(ationt Biolon,' Laborutorvs U\ llivers/t loi N ) c 4 o S E1ssaN on Criticismii \\Wbile sN npathlliziimn deepl t ith \eC- N itt ie leS C t ter X . Gropi() ^ngi 1( tht1 1o*gl sp11o- kenll g-11flish" (I Sept., 1p. 992') 1 fcel we should per-haps bealr in mind1 the sselI-ktovn v ords ol')f Alexaindler Plop. To eCnl' is hulmllan . . .' D.\isz I to\i .\-. C(/ic:l( I'oli(N Di) INsioll, LNT.S( 'O, IPicc (/1 FowciolvCli lN ri 7'. Fr(mcc can't find it ? -w ask MC Looking for a laboratory chemical that's not commercially available? A new item, or a familiar one made to a higher standard of purity? We're interested-maybe we can produce it for you, or suggest a source. We'd like to hear from you.Write us at 2909 Highland Ave, Norwood, Ohio 45212 or phone (513) 631-3220. Division of The Mathesonm ompany Inc. Norwood, Ohio; East Rutherford, N.J.; LosAngeles. Sd tFs\(- V 5 Ot. 1S

it? - Science · light chains are synthesized in a con-tinuIous fashion from the amino-to the carboxyl-end without intermediates. This apparently preCILudes a separate synthesis of

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Page 1: it? - Science · light chains are synthesized in a con-tinuIous fashion from the amino-to the carboxyl-end without intermediates. This apparently preCILudes a separate synthesis of

Announcing theNew EA

System for

ELECTROPHORESIS

EA-4 Power Control SupplyDesigned especially for electropho-resis. Continuously variable voltage 0to 500 V. Stable: Supplies constant volt-age. (Ripple less than _- 0.1%. Unitregulates to 0.1°o.) Also can supplyconstant current over entire range. Novariance in mA wvith change in load' 900o. DoLble scale meter shovws Vand mA. Exclusive built-in timer withauitomatic hshut-off. Four chiambers-SimliltancoLus operationi (7 tests [Derchamber). Constant cLirrent controlover ecitire electIophoretic range.

LEAH1 Eliectrophoresis ChamberHigh impact poly tyrene; water coolingjacket. Dumed see-through lid. Safetyinterlock. Platinum olectrodes run en-tire chamber length. Polarity reversingswitch. Simple, accurate method ofattaching sample strip with flexibleholders in integral part of chamberunit.This system offers features and advan-tages never before found in electro-phoresis equipment. The design is su-perb-and the system was precisionbuilt by scientists expressly for scien-tists. 01ir free brochure will give you afull description complete with addi-tional pictures.

FREE BROCHUREli____ ---I____

jMAIL COUPON TODAY!;Carl Schleicher & Schuell Co.Keene, New Hampshire-Dept. S-9-67Please send free brochure on nevwS&S/EA System for Electrophoresis

Name

CompanyAddress

CityState Zip 4

STOCKED BY: Van Waters & Rogers, Inc.Will Scientific, Inc. E. H Sargent & Co.

but a basis for real corrective aictionwill have been obtained. Berkeley didnot reach its PICSent positioIn by xvirtLneof pireferential treaLtmlent by federalagencies. If Ohio (and other states insimilaIt- situLa'tions) ldecides to dlisCarI-dher cornIfortlable svhippin, bos arid at-temiipt r-cal improvement, both Ohio anidithe 1naItion ill neilefit.

1. DF-RRAL MUI 1101n 1 \NDPmtN Otficc Bo-x 631,La Calnada, Calfiformiia 91011

Burgeoning ABNI Costs

The Lanitbiallistic imlissile p ort im I,

aoIut to receive aI $5-billion1 dosinpa menlit flrOllm OLII osl ernnotit. TIhisinitial program may lbe expanided ititoan estlimaLted S40 bIillion project. If so.the dark fillnan1ciall clouId nIOW halng1`12ingoVer other goern iment progt-ams; MaV

erove to be merely the begitinitin of along' nigtht.

I amii toldl that. in foreign Policy.ill othter- area.lS goenmcI-11enltal decisionlsaire made by a riocess of aIccommodat-ino diverse and conflictirn, iterests.Scientists. ws hether pUIrC, applied, orintermediaIte. are combatailts in a lonn.unrelenIting wvar against poverty, imiis-!e dlisease, nid ign1oIrance. As `uIchI.wve have a legitimte vested interIest inad ocalting foreign policies which telndto keCep CxpCndCitures for nationral dle-fense s ithin realsonable limits.The sciClntific comuniLIllity needcs to dic-

cide ss here it stlands onl CrUlciadl issu4esa>nd( then to apply presstirc in aippro-priatC pla1.ces. I sug1est an1 LIniasedpoll of the reLaIders of Scic,cc, or ofs,ome othier sULitaIbl\ choseni popu1-flatioll.to dceter-miiine w hich issLes evoke somiedeCe1-CC of conISenIsLs.

BsI{Uctt S. JsCottsoN-Radli(ationt Biolon,' Laborutorvs

U\llivers/tloiN ) c4 oS

E1ssaN on Criticismii

\\Wbile sN npathlliziimn deepl t ith \eC-N ittie leSC tterX . Gropi()̂ngi1( tht11o*gl sp11o-kenll g-11flish" (I Sept., 1p. 992') 1 fcelwe should per-haps bealr in mind1 thesselI-ktovn vords ol')f Alexaindler Plop.To eCnl' is hulmllan . . .'

D.\isz Ito\i .\-.

C(/ic:l( I'oli(N Di) INsioll, LNT.S( 'O,IPicc (/1 FowciolvClilN ri 7'. Fr(mcc

can't find

it? -w

ask MCLooking for a laboratory chemical that'snot commercially available? A new item, ora familiar one made to a higher standardof purity? We're interested-maybe wecan produce it for you, or suggest asource. We'd like to hear from you.Writeus at 2909 Highland Ave, Norwood, Ohio45212 or phone (513) 631-3220.

Division of The Mathesonm ompany Inc.

Norwood, Ohio; East Rutherford, N.J.; LosAngeles.

Sd tFs\(- V5 Ot. 1S

Page 2: it? - Science · light chains are synthesized in a con-tinuIous fashion from the amino-to the carboxyl-end without intermediates. This apparently preCILudes a separate synthesis of

~~~~~~~~~~~~~~~~ 4Q44 jl '* i a

.> A a - 4

I 4

m

Page 3: it? - Science · light chains are synthesized in a con-tinuIous fashion from the amino-to the carboxyl-end without intermediates. This apparently preCILudes a separate synthesis of

going to be drafted, or when. Manystudents are applying for graduateschool admissions and fellowships as ifthe Selective Service Act didn't exist,because there is not much else they cando. Administrators will have difficultyplanning class sizes, budgets, and fel-lowship programs when they believethat many of their prospective stu-dents-without knowing how many-will never make it to campus. Andthere probably will be some repercus-sions on undergraduate teaching, whenfaculty members cannot get enoughteaching assistants to handle sections inlarge introductory courses.

Even a shift to the pool of 19-year-olds (with selection made either bylottery or by the House committee'ssystem) would not altogether end theconfusion. Because they will be given a"constructive -age," college graduatesand graduate students do not escapeentirely under this system just becausethey are over 19. Substantial numberswill still be inducted. Betty Vetter, headof the privately supported ScientificManpower Commission,* has madesome rough calculations about theeffects of shifting to the pool of 19-year-olds. She figures that, under certain pos-sible circumstances, as many as 60percent of the college graduates wouldprobably be inducted.

It is obvious that, with various as-sumptions about the size of the draft-age pool, the size of the draft call, thenumber of volunteers, and the numberof deferred areas of graduate study, theresult can easily change. The studentmay have very little idea what hischances of being called are, especiallyif the administration's lottery plan failsand the Pentagon decides to resort tothe plan of the House committee. Thepresent law aggravates this problembecause it does not let the student enterschool with a guarantee of completinga full year of study. The old 1-S-Cdeferment, which allowed him to finishthe year, disappeared with the old law.Come September, any student who takeshis chances by entering graduate schoolin the fall could be drafted anytimeduring the year, his time and possiblyhis tuition being lost in the process.Will he want to take that risk, or waita year until his time of maximumvulnerability to the draft has passed?

University administrators are finallybeginning to feel the weight of thesequestions. Two weeks ago, in Boston,*The best summary of the new draft act canbe found in a small pamphlet prepared by theScientific Manpower Commission, 2101 Constitu-tion Avenue, N.W., Washington, D.C.; 25 cents.

758

the Association of Graduate Schools(AGS) passed a resolution asking thatstudents be informed at "natural timesof transition" (the last year of highschool, the last year of college) of theirchances of being drafted. The associa-tion supported a lottery and asked thatgraduate students who have begun adegree program be allowed to finish.The American Association of Uni-

versities, meeting at the same time inChicago, considered the AGS resolu-tion but decided not to adopt it; in-stead, the AAU will send representa-tives to Washington to speak to govern-ment officials. According to AAUspokesmen, the association's representa-tives will only plead for a speedy clarifi-cation of the present situation, not ad-vance a favored plan for changing thedraft. Even this goal, however limited,may be difficult to achieve. If theadministration decides, for example, tosubmit a new lottery plan, it can moveno more quickly than Congress does,and the next session does not openuntil January.

Probably the best the universities cando is hope. Many of the changes theyare supporting have already fared ratherpoorly in Congress. Only an adminis-tration that is convinced of the inherentadvantages of another induction sys-tem-one approaching the military idealof younger induction-will want toassume the political problems of re-opening the draft issue before a hostileHouse. Any cause for change willprobably have to be made on its mili-tary and manpower merits alone. Theuniversities, increasingly identified ascenters of resistance to the war, wouldprobably not be at their most persua-sive before the Armed Services com-mittees.-RoBERT J. SAMUELSON

APPOINTMENTSGeorge W. Stroke, professor of elec-trical engineering, University of Michi-gan, to professor of engineering andmedical biophysics, State University ofNew York at Stony Brook. . . . Lind-say S. Olive, professor of botany, Co-lumbia University, to professor ofbotany, University of North Carolina.. . . A major reorganization ofthe University of Pittsburgh has ledto the following appointments: CharlesH. Peake, vice chancellor of theacademic disciplines, to acting pro-vost; A. C. Van Dusen, vice chancellor

of the social professions schools, to vicechancellor for program developmentand public affairs; David Halliday, deanof the division of natural sciences, todean of the College of Arts and Sci-ences; and Francis S. Cheever, dean ofthe School of Medicine, to vice chan-cellor for the health professions....Edward F. Bland, clinical professor ofmedicine, Harvard Medical School,to clinical professor emeritus....Hendrick W. Bode, soon to retire asvice president of the Bell TelephoneLaboratories, to Gordon McKay pro-fessor of systems engineering, Harvard.

RECENT DEATHSRobert Boggs, 65; former dean of

New York University Post-GraduateMedical School; 25 October.

Harold W. Glattly, 65; former chiefsurgeon of the First and Second Armies,and executive secretary of the prosthetic-orthotic education committee, the skel-etal system committee, and the genito-urinary system committee, Division ofMedical Sciences, National ResearchCouncil; 26 October.

Carl C. Kiess, 80; professor of op-tics and spectroscopy, Georgetown Col-lege Observatory; 16 October.

Lawrence Litchfield, Jr., 67; retiredpresident and board chairman of theAluminum Company of America; 28October.

Bayes M. Norton, 64; professor ofchemistry, Kenyon College; 25 October.

William H. Perkins, 73; former dean,and professor emeritus of preventivemedicine, Jefferson Medical College; 22October.

Robert B. Sosman, 86; professoremeritus of ceramics, Rutgers Univer-sity; 30 October.

Joseph Stoeckeler, 59; principal soilscientist, U.S. Forest Service; 16 Oc-tober.

Willem A. van Bergeijk, 37; profes-sor, center for Neural Sciences and de-partment of zoology, Indiana Univer-sity; 8 October.

Stephen S. Visher, 79; professoremeritus of geography, Indiana Univer-sity; 25 October.Adam H. Zimmerman, 65; former

chairman of the Defense ResearchBoard, Ottawa, Canada; 30 October.

Erratum: In "'Resonance rotation of Venus"by I. I. Shapiro (28 July, p. 423), the word "in-cluded" in the second line of the abstract shouldbe "inclined." The longitude of feature 1 inTable 1, under present determination, is "12.1"whereas the correct value is "128.1."

SCIENCE, VOL. 158

Page 4: it? - Science · light chains are synthesized in a con-tinuIous fashion from the amino-to the carboxyl-end without intermediates. This apparently preCILudes a separate synthesis of

MODEL P90D MODEL CD25

magnetic reluctance1~;~L0W PRESSUREQ--.-

TRANSDUCERand INDICATOR

P90D TRANSDUCERRange: -' inch water, full scale, with

overload talerance I 00 psi.Law Acceleration Sensitivity.Wide Dynamic Response Range.Pressure Media.: Carrasive liquids andi

gases, bath sides.L'ine Pressure. Vacuum to I .000 psi.

CD25 INDICATORAnalag and digital readout.1% Accuracy meter.Recorder Output -i-1t VDC, tlat fram

o to '000 cps.Works with LVDT's, too.

WVri't" Jir coniplete PACE! Wiranco ciat(iloii

814

light chains are synthesized in a con-tinuIous fashion from the amino- tothe carboxyl-end without intermediates.This apparently preCILudes a separatesynthesis of the variable and constantportionis of the chains (with a la,ter-unIon01) untder the direction of mianygenes f'or the xvariable part and onlVonie for- the constalnt pa,rt. Twxxo Him-portant concepts on the control ofbiosN nthesis ot lantibodies swere brourz-Ihtouit bN' G. J. V. NO~saIl (Rox a,l Mel-bouLrne Hospital, Au]Str-alia) and otli-er-s: first the concept of the commin'ttedcell wxhich miakes onlv one kindc of'lie-ht chaini 'and onie kind of heavvchainf, and secondc, that the cell recoc-nilezs its 0own pr1odcICt, in a sense as

if it Nx cr-c an antibodxv NI. Cohn (Salk,ustitnCe InI an1 cleeat SuImmnarx pre-

senitedl a, (cnetic thcorxv for- the div ersit\xofI mm unog10lobalihns xx hich wxas con-

testcdi by the pr-oponents of' the Smiith-icx, thcorxv oft antibodv dliversitv andLof, othrlic xhpothescs of' genietic recombi11-nlatio or- mul-tip-liCitx. NI. Sela's dra-IllitIC Irrixval friomi Israel juist alfter- thccc.lse fire' ca-talxvzed thce scnisc of, in-

tern.iiional~1itx of this gtei of SCI-

cnItistS frnIliJuNl11mvLands aInd dli\ crschac k- Lcunds. Thc pi-oceedinres of' tI-ncX\Ccllct meeCCtIn xx2Will he pubL )IIS1ise.beforej- the C,Ilxea isot. aIS the NobelsmpsyliumIIIIIli.

FRANK WV. Ptur]Nx"si[)ivis ion olf Biolot,-ical Sc iu(1((,'I1(i(ciciiii (Utin r;su B3/oomin;gton 474) /

Calenidar- of Events-November

Na-tioilial Mletinigs

0'(-2 I. ManpJow er for Ocelmograplhy,..JICtnAt on sxvip.. HoustOnl. Tex.. ( AmetCanCSoc. for) Oceanmocr.i-tphx 8-54 Maltin Buildc-ing. HOus,ton 77002)

20-12. Amerccan Ph\ sies Soc.. annualNess Or ea-ns, Lat. (I. 0. Katlliokoski,t)ept. of CicoIoex,\, Pi-incetoni Unix., Pt ince-tori. N.J. 08540)

20 221 Amer jea"n Phxvsics Soc., annlualFluid DN namics tIItI Bethileherii, Pa,.(P. S. Klebanoff, NatI. Bureau1- of Stand-at dS. C ti11riCCtieCLt Axe. ait Vatn Ness St.,N XXV. Washiungton. D.C. 2(0234)

()1.Geological Soc. of America,innuatii mte.z. News Or-leans, La. (G. F.NI nit as. Texa,s Technlicat College, Box4680. [echnicatl Stationi. Lubbock, Tex.,or- Mis., D. C'ur is, Shellf Oil Co., Box60t 931, New t)rlea1,ns 70160)

20 22. Geoclieniiical Soc., annual imtg.,Nes Orleans.IIa-).:(F.' C -T. C lia,-N (

[ .S. GCOIOlusiCal SUrrxVeV. WXashirngton, D.C .)19-22. 'Mineralogical Soc. of Amelr icl.r

Ness Or lea-ns, La,. (G. Sssitzer, "'( tU.S.Nlat ritua NtLuseLun. XXVash ington. D.(.

29 22. P'aleontological Soc. of Amecrica,SCIENCE, VOL. 198

Let us Showv You-What these new mi'croscopi'c techni'quesCan do for YouInterference Contrast lNomarskrttlii its% c0niir.st tecciniteLe revcals Sp)ccintcniZTOAidtct,iils nut ibitttinalie atsins oitrir contrist nistnloo4.

Contrast Fluorescence Microscopy'FIIIs cci. (LIsreC' Cih I'. cxanintInohin citlIiioircscentSpi rcinsC1 in pii'iti-s 'it ndl niesqtis% cpl1i.ise ci ntrastSIniLIt InIIII( SCiin trr,IS tricioresccilcc'

Microphotonietric Measurementsio tc (Ii ianititivs dcrcrimin.itiiin of rccilcctiv its.

.ibsiirpr%tis itndtt (-tinctilin iir fliiri' con(C iitteisitV'I dIIIt~ r cir ii itiiii ss I'tiP s- ,isv Ii.nglt h nitmuins oft ni,% ii lhirt rI'criiphiitiiisitcrltP tiitr ncinhs iin

Automatic Photomicrography

nis in iii Icticcil i. i ItIctc IIn

REICHERT RESEARCH MICROSCOPE "ZETOPAN-

N'stint11 fu r rcilicitcd tcunsnsittcil .ind iiiii ligi t.

pl I attun i cc putPC tiiit'flttL I

h ()rc fi \n it ititI

i

Request literature and demonstration of the ,ZETOPAN'V\i

William J. Hacker & Co., Inc.nitx 6iP Wci ti tt (tIt ill ""~I I ts Jcrscs- (-0(2()]i 22,.( 501

MOLECULAR

MECANIMSOF

TEMPERATURE,

AADAPTATION

dIcttcd hx C. L\sum PRossi-JzPirOl sthed Jutsv 1967

\sx ii(siinipircniiseritect at theBerl.elev MleCtiun tf AA\A\S. l-)e-c..'tiihc' 1 96's, XAA.\S Puhbl cation)No. 84, 398 pa't(es, 41 table 7I'lustiratirris, fibiM(iloc aphVx ilicte \.Rc,pilair Pr-ice S12.50). X.N \S Nliem-tiers' C ash Orcder-s $101. 50.

itf pa-pers on; the gener,al phx simloex,Ot tem1j)len atLure ad'aptlation in cttlclfht decl an ilal s, plants. andrict-ci10iio u"tar1IrsmIlS. Twsseritv four con-itrihtit(ttS froml thle Smsx ict Uii it0in.CCra ,mCarada, Denmark,' arid

thec Uiitect Staltes report recenit recseli- el ifindingis oni the dix ercIsenOiClcl atr mechanmisms (if respirrse.aeelrriatimrn, arid ladaptlation to he.itaric cocld in tiacterila, plant cellsarind tissties. inisects, fishes, amiphi-tirans arind r-eptiles.

AAAS1515 Mlassachtusetts Ave.. NWV

WVashington, D.C. 20005

Page 5: it? - Science · light chains are synthesized in a con-tinuIous fashion from the amino-to the carboxyl-end without intermediates. This apparently preCILudes a separate synthesis of

New Orleans, La. (R. L. Langenheim,Dept. of Geology, Univ. of Illinois, Ur-bana)

26-29. American Medical Assoc., clin-ical conv., Houston, Tex. (W. E. Bur-meister, Director, Convention ServicesDept., AMA, 535 N. Dearborn St., Chi-cago, Ill.)

26-30. American Inst. of Chemical En-* gineers, 60th annual mtg., New York, N.Y.(H. I. Wolff, Shell Chemical Co., 50 W.50 St., New York 10020)

26-1. Radiological Soc. of NorthAmerica, 53rd annual mtg., Chicago, Ill.(M. D. Frazer, RSNA, 713 East GeneseeSt., Syracuse, N.Y.)

27-29. American Astronautical Soc.,natl. mtg., New York, N.Y. (N. Levin,Guidance and Control, Plant 35, Grum-man Engineering Corp., Bethpage, N.Y.11714)

27-30. Entomological Soc. of America,annual mtg., New York, N.Y. (R. H.Nelson, ESA, 4603 Calvert Rd., CollegePark, Md.)

27-1. Chemical Industries, New York,N.Y. (International Exposition Co., 200Park Ave., New York 10017)

28. American Soc. of Therapeutic Radi-; ologists, Chicago, Ill. (J. A. Del Regato,Penrose Cancer Hospital, Colorado Springs,Colo. 80907)

29-30. Society for Industrial and Ap-plied Mathematics, fall mtg., Santa Bar-bara, Calif. (H. B. Hair, 33 S. 17 St.,Philadelphia, Pa. 19103)

29-1. Wire and Cable Symp., AtlanticCity, N.J. (J. Spergel, USAEC, FortMonmouth, N.J. 07703, attn: AMSEL-KL-EE)

30-3. American Anthropological Assoc.,annual mtg., Washington, D.C. (C. Frantz,1530 P St., NW, Washington, D.C. 20005)

International and Foreign Meetings

20-28. Hurricanes and Tropical Mete-orology, 5th technical conf., Caracas,Venezuela. (K. V. Spengler, AmericanMeteorological Soc., 45 Beacon St.,Boston, Mass.)

21-25. Radioisotope Tracers in Indus-try and in Geophysics, symp., Prague,Czechoslovakia. (Intern. Atomic EnergyAgency, 11 Kartner Ring, Vienna 1,Austria)

23-27. Geological Soc. of America, fieldtrip, Yucatan, Mexico. (B. B. Hanshaw,U.S. Geological Survey, Washington, D.C.)

26-30. Pan American Medical Assoc.,42nd annual congr., Buenos Aires, Argen-tina. (J. J. Eller, Director General, 745Fifth Ave., New York 10022)

26-1. World Federation for MentalHealth, 20th annual mtg., Lima, Peru.(Administrative Hq., 1, rue Gevray,Geneva, Switzerland)

27-2. Science and Technology in De-veloping Countries, Beirut, Lebanon. (C.Nader, American Univ. of Beirut, Beirut)

28-30. Decomposition of OrganometallicCompounds to Refractory Ceramics, Met-als and Metal Alloys, intern. symp., Day-ton, Ohio. (E. W. Stefanko, Univ. ofDayton, Dayton 45409)28-30. Trombosis, intern. mtg., Wash-

ington, D.C. (S. Sherry, Washington Univ.School of Medicine, St. Louis, Mo.)10 NOVEMBER 1967

Tens of thousands of dissertationshave been written.That's not news.

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than 126,000 post-1938 dissertations we havein our files (including 95% of those writtenlast year at U.S. and Canadian universities);retrieves, with computer speed, titles of desireddissertations; and prints out the desired bibli-ography. Positive microfilm or bound xero-

graphic copies of the complete dissertationscan be ordered.

DATRIX is another new service of Univer-sity Microfilms, a pioneer in making the librarya more efficient research tool.

Using DATRIX is simple and direct. Withour order form and descriptive words selectedfrom a key-word list supplied, the researcherdefines his specific area of interest.

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300 N. Zeeb Road, Ann Arbor, Michigan 48106.

XEROXEDUCATION DIVISION

UNIVERSITY MICROFILMS LIBRARY SERVICES

DATRIX IS A TRADEMARK OF XEROX CORPORATION.

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