A100-watt bulbconsumes as much power asthe magnet in our NMR Spectrometers.

Model R24A. 60 MHz 'H NMR Spec-trometer. Digital sweep X-Y recordingsystem. Best buy in low-cost field.

Since Perkin-Elmer's entireline of NMR Spectrometers em-ploys permanent magnets, theonly power required for themagnet is for thermostattingand supplying the Golay coils*.They need no troublesome

cooling water and no noisywater refrigerator.

In fact, the savings in oper-ating costs alone could pay forthe cost of the instrument in aslittle as 7 years.

But economical operation isonly one of the many benefitsyou get with our permanentmagnet Spectrometers. Othersare: unmatched resolutionstability; amazing ease of set-up; and high throughput.

If you are planning to add toyour current NMR capabilitiesor just getting into NMR, it willpay you to get more informa-tion on the entire Perkin-Elmerline of permanent magnet NMRSpectrometers.

Instrument Division, Perkin-Elmer Corporation, Main Av-enue, Norwalk, Conn. 06856.'Perkin-Elmer patent numbers 3,515,979 and 3,622,869.

Model R12. Versatile 60 MHz NMRSpectrometer. Can be equipped tosolve the most demanding NMRproblems.

PERPKIN-ELMEIRCommitted to helping your samples tell you more.

Circle No. 407 on Reoders' Service Cord

The Model R32 NMR Spectrom-eter is the first high-field instru-ment designed with the chemistin mind. This 90 MHz Spectrom-eter for H, '9F and 31 p studiescombines rugged construction,high stability and ease of oper-ation. A Triple Resonance Ac-cessory provides automaticfield frequency lock and makesdouble resonance experimentssuch as spin tickling and IN-DOR part of the day's routine.

Variable temperature oper-ation down to -100 0C isachieved without the use ofliquid nitrogen.

"t~f' )f

Worthington Collagenase...

specifically blendedfor cell isolation.

In microbiological studies of animal cells, it often Evaluation of these studiis desirable to isolate and separate the cells for further gorize our crude Collagenasestudy. The researcher's need is to separate the cells from which are blended and classifiedthe connective and cementing materials without damag- tissues for which each is best siing the cells themselves. available as listed in our curren

Many researchers found that a natural mixture of TYPE CHARACTERISTICdigestive enzymes produced by a non-toxigenic strain of the -bacterium Clostridium histolyticum provided the separa- I Normal balancetion remarkably well. The enzymes, without the toxin II High Clostridiopeptidasethat many of the Coistridia produce, effectively digest III Low Proteases generallyaway the materials connecting the cells into a tissue, but IV Low Tryptic activityleave the cells themselves virtually untouched. The increasing use of Co

The enzyme mixture is named after its more unique is encouraging. Credit for the pImember, Collagenase. Worthington supplies Collagenase the many researchers who coopein several degrees of purity ranging from crude to highly- time and talent.purified; researchers have generally found that the less Your comments and intpurified material is more effective in releasing intact cells tional information on this appli(from tissues. The effectiveness, however, seemed to differ a copy of our current catalog arewith different tissues, and it did not always match thequantitative differences noted in our assay labs.

A program was therefore initiated by Worthingtonaimed at correlating effectiveness of samples on specifictissues with results of our own biochemical assays. We en-listed the support of several dozen prominent researchers;they evaluated more than a hundred samples of regular WRTWI-Nproduction and specially prepared lots of Collagenase in Iiitheir own studies. Worthington Biochemical CorporationI Fr

Circle No. 408 on Readers' Service Card

ies has enabled us to cate-into four different typesi according to the specific,uited. The four types areIt catalog.

TISSUE BEST SUITED

Fat cells; Adrenal tissueLiver, Bone, ThyroidMammaryPancreatic Islet cells

Ilagenase in cell isolationtrogram's success is due torated so openly with their

:erest are welcome. Addi-cation of Collagenase andavailable on request.

ll'''lllKjTON

reehold, New Jersey 07728 U.S.A.

.M

45The observatory of the CollegioRomano, where Jesuit astronom-er Father Angelo Secchi (1818-1878) madethefirst spectroscopicsurvey of the heavens.46 Museo Copernico ed Astro-nomico where Polish AstronomerNicolas Copernicus did much ofhis early work.47 Naples. The Zoological Station.48 University of Padua. The ana-tomical theater was built in 1594by Fabricius of Acquapendente, apioneer of the comparative meth-od of anatomical research anddiscoverer of valves in the veins.

Vienna. 49 The Pharmakognos-tiches Institute, which houses amuseum of 10,000 items of sci-entific interest.

50 A reconstructed apothecary,laboratory and print shop in theTechnisches Museum fur Indus-trie und Gewerbe.Czechoslovakia. Gregor Mendeldid his landmark work in geneticsin a 51 monastery in Brno.Still in Prague. 52 Charles Univer-sity where you will visit the roomsin which Einstein, Ernst Mach andPhilipp Frank taught and worked.Germany. Munich. 53 The Deut-sches Museum. Reconstructionof the laboratories of Lavoisierand Liebig.

54 The Werner von Siemens In-stitute, where electrical engineer-ing and research are traced from1850.Heidelberg. 55 The Deutsches-Apotheken Museum, an ancientcastle packed with apparatus anddrugs, vessels and relics.56 The Deutsches-Roentgen Mu-seum in Remscheid preservesRoentgen's apparatus, includinga 1905 X-ray lab.57 The Deutsches Gesundheit-museum in Cologne.Berlin. 58 Chemistry Institute,where Otto Hahn split the urani-um atom in 1938.East Berlin. 59 The Robert KochMuseum. Koch, co-father of mod-ern bacteriology, used glass slidesto grow cultures until his assis-tant, Julius Petri, invented theglassware that carries his name.

60The home and garden of Alex-ander V. Humboldt.61 The library of Max Planck.62Charite Hospital where RudolphVirchow, founder of cellular path-ology, first described leukemia.Cracow, Poland. 63 CollegiumMajus for a look at the telescopesof Copernicus.A jet to Rumania and a drive toCluj for a visit to 64 an 18th-centuryapothecary shop.

Greece. 65 The Lyceum, whereAristotle taught from 355 B.C.until just before his death. 66Plato's Academy.Istanbul. 67 Pergamon whereGalen practiced medicine.Bombay. 68 The Tata Institute ofFundamental Research, devotedto nuclear research, computer sci-ence, molecular biology, radioas-tronomy, and mathematics.69 The Bhabha Atomic ResearchCenter is India's national centerof research for the peaceful useof atomic energy.70 The Yoga Institute. Here youcan learn Yoga culture, techniqueand scientific discipline.Russia. 71 Academy of Sciencesin Leningrad. Pavlov's lab.72 The Anthropological and Eth-nographical Museum.73The Mendeleyev Research In-stitute.Moscow. 74 The National Eco-nomic Achievements Exhibition.Tokyo. 75 The Kitasato Institute,founded by Baron ShibasaburoKitasato who isolated the agentswhich cause bubonic plague anddysentery.You're back on American soil whenyou visit 76 the Hawaii VolcanoObservatory.To wind up your trip we want to

give you the opportunity to seeany four labs in the U.S. 77, 78,79, 80 which hold particular in-terest for you. We will do our levelbest to arrange a visit for you tofour labs of your choice.OFFICIAL RULES -NO PURCHASE REQUIRED1. This sweepstakes is only open to thoseemployed in medical, educational, or indus-trial fields who normally work with labware.Or who supervise or administer a laboratoryOr who purchase or stock labware2 To enter complete this official entry blank,or, on a plain 3 x 5-inch piece ot paper, hanoprint your name, address, and field of activity.3. Enter as often as you wish, but each entrymust be mailed separately to- Around theWorld in 80 Labs, P.O Box 1730. Blair, Ne-braska 68009. Entries mTust be postmarkedby September 30, 1974 and received by Oc-tober 15, 1974.4 One winner from each of the three fieldsof activity-industry. education, and med-icine-will be picked trom among all entriesreceived in random drawings conducted bythe D L. Blair Corp., an independent judgingorganization. Decisions of the judges aretinal. Winners will be notitied by mail Winnerswill travel in a group departing on a date tobe selected by Corning Glass Works. Departureis estimated to be between the months ofMay and July, 1975 for a trip duration of 30days. Corning Glass Works reserves the rightto modity trip itinerary as a result of con-ditions prevailing at time of prize award. Nosubstitution for prizes permitted. Entrantsmust be residents of U.S.A.5. This sweepstakes is void where prohib-ited, taxed or restricted by Federal, state orlocal laws and regulations. Employees ot Corn-ing Glass Works, its advertising and sweep-stakes agencies, dealers, and their familiesare not eligible. Federal, state and other taxes,if any, are the responsibility of the prize winners.6. All prizes are guaranteed to be awarded.Names of the prize winners will be furnishedto anyone who sends a stamped, self-address-ed envelope to Corning Laboratory Sweep-stakes, Corning Glass Works, Corning, N.Y14830.

30

19

Around the world in 80 labs.I The World of Science. Now there's an idea that really sends mne. Here's illy elitry.

am engaged in (): OI Medical O Educational n Industtial Activity

IName

| Firm/Affiliationr_Business Address aCity State ZIP----------- CMakers of PYREX labwareIMy Corning dealer salesMan is M kr fP RX awr

For two weeks last summer (June 20-July 4, 1973) a significant international scientificmeeting took place in Mexico City. "Science and Man in the Americas" was attended bymore than 5000 scientists, engineers, government officials, representatives of business andindustry, science journalists, students, educators and laymen from scores of countries.They deliberated a wide range of topics central to the future development and well-beingof the Western hemisphere. The meeting, co-sponsored by AAAS and the Consejo Nacionalde Ciencia y Tecnologia of Mexico, was created in the belief that science is of overridingimportance in the world today and that, being universal, it transcends national boundaries.Here now, captured on audiotape, are many of the most compelling sessions, available forlistening, study, and reflection in your home, library, laboratory, automobile. Another serviceof the AAAS.

NON-NUCLEAR ENERGY FOR DEVELOPMENT: Arranged byEdmundo de Alba and J. Frederick Weinhold.Session I EO The World's Energy Situation: David Freeman,

Jean C. LeclercqSession II O Energy in the Americas: J. Frederick Weinhold,

Fernando Hiriart, Gordon McNabb, Guillermo0. Zubaran, et al.

Session III O Energy for Rural Communities: Francisco Mon-teverde, Thomas Venables, J. Neal Thompson.

Session IV O Wind and Solar Energy: Edmundo de Alba,Julio Hirschmann, Peter Glaser, Robert Axt-mann, et al.

Session V O Geothermal Power: Federico Mooser, RobertDecker, Richard Stoiber.

Session VIl Relationship Between Environmental Protec-tion and Energy: Juan Eibenschutz, MiguelAngel Garcia Lara, et al.

EARTHQUAKE AND EARTHQUAKE ENGINEERING: Arrangedby Don Tocher and Enrique del Valle C.Session I EO The 1972 Managua Earthquake: Emilio Rosen-

blueth, R. B. Matthiesen, John A. Blume,Enrique del Valle C., et al.

Session II O Seismicity: Alan Davenport, Luis Esteva, Don-ald E. Hudson, William Milne, and Jose Grases.

Session Ill Earthquake Engineering: Julio Kuroiwa, JosephPenzien, Jorge Prince, Patrico Ruiz, RobertoMeli, et al.

Session IV O Seismic Intensity and Smooth Spectra, Zoningand Structural Design: Enrique del Valle C.,R. B. Matthiesen, Arturo Arias, et al.

CIVILIZATION'S FUTURE: WAS MALTHUS CORRECT?Session I El Lecture by Norman E. Borlaug

THE SEA AND ITS RESOURCES: Arranged by Agustin Ayala-Castafnares, and Arthur E. MaxwellSession I El Introduction, Coastal Zone Resources, Ocean

Effects and their Management: Harris B. Stew-art, Jr., Bostwick H. Ketchum, and Julian Adem.

Session II El Resources of the Sea: Robert R. Lankford,Martha Vannucci, and Warren S. Wooster.

Session Ill El Coastal Resources: Bostwick H. Ketchum, Her-mann Ugarte, Richard G. Bader, Robert War-ren, et al.

Session IV E Ocean Effects on Weather and Climate: JulianAdem, Donald Gilman, R. Simpson, J. Kuettner,Jay S. Winston, and Kirk Bryan.

Session V E Non-Renewable Resources: Robert R. Lank-ford, Fred B. Phleger, Alberto G. Lonardi,John p. Albers, Melvin Peterson, et al.

Session VI El

Session VII El

Living Resources: Martha Vannucci, MarioRuivo, Paul E. LaViolette, James Joseph,A. Novak, et al.Ocean Affairs: Warren S. Wooster, John A.Knauss, Jorge A. Vargas, Harris B. Stewart,Geoffrey Kesteven, et al.

THE IMPORTANCE OF EDUCATION IN DEVELOPMENT: Ar-ranged by Albert V. Baez and Guillermo Massieu.

Session El Educational Technology: Alfonso Ocampo Lon-dono, Albert V. Baez, Sam Castleberry, JosephLagowski, et al.

Session II E Laboratory Materials and Teaching Aids:Nahum Joel, Ernst Hamburger, Rafael Ferreyra,Thomas Taylor, David Lockard, et al.

Session IlIl E Motivation and Learning Processes: DavidEhrenfreund, Mary Budd Rowe, Felix Morales,Claudio Dib, et al.

Session IV El Science Teaching at High School, Junior Col-lege and University Levels: Manuel ServinMassieu, Michael Pentz, Gabriel Camara Cer-vera, et al.

Session V E Toward Qualitative Educational Planning: DonAdams, Manual Bravo Jimenez, Hernan Vera,William Platt, Douglas Wright, Bernard Kaplan,et al.

Session VI E The Improvement of Teachers Education: ErnstHamburger, Nahum Joel, Carlos Gomez, OlacFuentes, Luis S. Capurro, et al.

DESERTS AND ARIDS LANDS: Arranged by Harold E. Dregneand Fernando Medellin Leal.

Session I El

Session II El

Session Ill El

Session IV El

Session V El

Planning Problems and Dilemmas in the Devel-opment of Arid Zones: Fernando Medellin Leal,Enrique Beltran, and Thomas Maddock, Jf.Solar Energy in Arid Lands: Hector Ruiz Elias,Gustavo del Castillo, Adam B. Meinel, MarjorieP. Meinel, Edward F. Haase, et al. 0Water Use Efficiency in Arid Regions: TerahL. Smiley, Jose Lizarrage Reyes, Ronald F.Probstein, Hasan Qashu, Lloyd E. Myers, et al.Educational and Cultural Needs of Desert ZoneInhabitants: Richard B. Woodbury, PatricioDreckman, Everett D. Edington, TheodoreDowning, Marion F. Baumgardner, Carl N.Ho,dges, et al.Storage and Retrieval of Arid Zone Data: DeanF. Peterson, Antonio J. Prego, Patricia Paylore,Guadalupe Carrion, et al.

SCIENCE, TECHNOLOGY. AND DEVELOPMENT: A NEWWORLD OUTLOOK:Session I E A lecture by Glenn T. Seaborg.

THE EARTH SCIENCES IN WORLD DEVELOPMENT: Arrangedby Guillermo P. Salas and Earl Ingerson.Sessltn I El Earth Sciences and Energy and Environmental

Problems: Charles F. Park, P. T. Flawn, P. S.Stepanicic, Eduardo J. Guzman, et al.

Session II E Geologic Research, Exploration and Develop-ment in Mexico, Central and South America:Diego A. Cordoba M., Carlos Ruiz Fuller, andEnrique Levy.

Session III E Application of Earth Sciences in the Develop-ment of Civilization: Charles F. Park, P. T.Flawn, Eduardo J. Guzman, et al.

SCIENCE, DEVELOPMENT AND HUMAN VALUES: Arranged byHarrison Brown and Victor L. Urquidi.

Session I E Where Have the Rich Nations Gone Wrong?Where Have the Poor Nations Gone Wrong?Guillermo Massieu, Hollis Chenery, Kenneth E.Boulding, et al.

Session II El Knowledge and Development in Latin America:Renee C. Fox, Carlos A. Mailman, RichardGriego, and Luis Villoro.

Session III E Research Priorities for Economic Developmentin Latin America: Jose Valenzuela, David Ibarra,and Norman Borlaug.

Session IV E The Value of Science and Technology to HumanWelfare: Luis Manuel Penalver, Gerhard Jacob,George Bugliarello, Joseph B. Platt, et al.

Session VI El Science, Technology, and Human Values: VictorUrquidi, Harrison Brown, et al.

VIOLENCE AND BEHAVIOR: Arranged by Santiago Genovesand J. P. Scott.Session I El Subcultures of Violence and Social Class as De-

terminants of Interpersonal Violence: BereniceA. Carrol, Sandra Bell Rokeach, John Saxe-Fernandez, Osvaldo Sunkel, et al.

Session II El External Dependency Structure and ScientificDevelopment: Chadwick F. Alger, MarcosKaplan, Sylvia Wynter Carew, et al.

HURRICANES: Arranged by Julian Adem, and Louis J. Battan.

Session El New Techniques of Hurricane Observation:Stanley Rosenthal, Luis Le Moyne, MichaelGarstang, Sergio Serra-Castelan, et al.

Session II El Hurricane Prediction and Modification Tech-niques: Pedro Mosino, Robert H. Simpson,Hector Grandoso, Cecil Gentry, et al.

TRANSFER OF TECHNOLOGY AND NATIONAL ECONOMICDEVELOPMENT: Arranged by Jordan J. Baruch and MiguelS. Mionczek.Session I E Economic Impact of Technological Change:

Anne Carter, Jorge A. Katz, Jack Baranson,Alejandro Nadal, Alan MacAdams, et al.

Session II E Social Impact of Current Rate of TechnologicalChange: Miguel S. Wionczek, Jerome Rother-berg, C. J. Meechan, Edmundo Fuenzalida, et al.

Session IlIl l Current Vehicles of Technological Trade I: C. J.Meechan, Robert B. Staubaugh, Ronald Muller,K. D. N. Singh, et al.

Session IV El Current Vehicles of Technological Trade Il:Mark S. Massel, Luis Soto Krebs, EnriqueAguilar, Luis Figueira Barbosa, et al.

Session V O Determinants of Technological Policy I: Fran-cisco R. Sagasti, Manuel Bravo Jimenez, RodrigoMedellin, Shlomo Argov, Alejandro Nadal, et al.

Session VI C Determinants of Technological Policy Il: MaximoHalty Carrere, Carlos Bazdresch, Jorge Sabato,Michael Michaelis, et al.

APPLICATIONS OF EDUCATIONAL TECHNOLOGY AND NEWMETHODS AND EQUIPMENT IN SCIENCE TEACHING: Arrangedby Alfonso Bernal Sahagun, Robert Branson, Thomas E. Taylor,et al.Session III E Program Development: Alvaro Galvez y Fuentes,

Jay Young, Robert Pecsok, Horacio GomezJunco, Maria del Carmen Millan, et al.

Session IV E] Television, Wide Territorial Coverage: Maria delCarmen Millan, Fidel Villarreal, Robert Branson,Isaias Raw, et al.

PSYCHODYSLEPTICS AND ADDICTION-MARIHUANA: Ar-ranged by Wallace L. Guess and Oscar Dominguez Vargas.Session I C Psychodysleptics, the Botany, Chemistry and

Pharmacology of Narcotic Drugs and Marihuana:Maynard V. Quimby, Carlton E. Turner, SolomonH. Snyder, Harold T. Conrad, Richard B.Resnick, et al.

EDUCATIONAL PLANNING: Arranged by Don Adams andManuel Bravo Jimenez.Session OQuantitative Aspects of Educational Planning:

Juan Chong, Cicily Watson, Jose Antonio Car-ranza, Hector Correa, et al.

Session II E] Implementing Educational Change: Guy Benve-niste, Jaime Castrejon Diez, Paul Watson, An-tonia Ramos, et al.

Available as 5-in. open reels (33/4 in. per sec. for standardmachines) or as cassettes. Price: single-session symposium,$19.95; multisessions, $19.95 first session, $16.95 each addi-tional session of same symposium. Each session lasts one tothree hours. Circle numeral(s) and check box for session(s) youwish to order.

Money order or check payable to AAAS-No Cash. Allow 3 to4 weeks for delivery.

Please Check:

Name

Street

City

-Reel - Cassette

State - ZipDepartment AT4

AMERICAN ASSOCIATION for theADVANCEMENT of SCIENCE

A A A 1515 Massachusetts Avenue, N.W.Washington, D.C. 20005

Attention libraries: write for special discount information forstanding orders placed for AAAS audiotapes, books, periodicals,bibliographies, and other educational services.

Whenyoure the leader,howdoyou followthe leader?

We introduced digitalplotting.

For the last ten years,our drum plotters have setthe standards of theirindustry.

Our 565, and the modelswe've built around it, havemade us the largestmanufacturer of drumplotters in the world.

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Circle No. 412 on Readers' Service Card

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