20 April 1973Volume 180. No. 4083

SCIE:NCE

LETTERS Faculty Organization: S. Jonas; Mediuml for Hybrid Selection: J. W. Littleficld;Brazilian Higher Education: F. M. Tiller; PCB Diet: E. J. Andrewvs; D. Jowvett:J. R. Alleui and D. H. Norback; Reaction to Rhetoric: F. P. Bornsteini:Snapping Turtle Plea: G. T. Nurse; T. H. Jukes and R. Hol/nquist ..........

EDITORIAL \ddritlional SOUrceIs of Financill and Political Support for Scienice...

ARTICLES MetgagIaU.S.s Physics: C. Ml. Fov/et.r...................................Invertebratte Color Visioni and the TuLned-Receptor Paradigm: G. S. Wasserman ....

W hereW e Are Now: S. Weinberg .......... ........................

NEWS AND COMMENT

RESEARCH NEWS

BOOK REVIEWS

Training (Grants (1): There Is Hope Some Max Be Salvagcd ..................

Natvv R & D: Will Congress Have the Nerve to Spear Trident? ................

Meatal Health: NIMH Reeling over Proposed Budget CuLts. ...............

Herhicides.- AAAS Stuldx Finds Dioxin in Vietnamese Fish . . . . .

Optical Data Storagc Mass Memiiorics for Futuire CompuIters? .............

Geomagnetism in Marine Geology, reviewed by A. Cox; Environmental Physiologyof Mlarine Animals, J. Kaniwisher; Insect Sex Pheromones, H. H. Shorey;Problemy Evolyutsii, Tl. Dobzhansky; Ions and Ion Pairs in Organic Reactions,R. A. Snieen; General Relativity, J. Stachel:, Books Received

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REPORTS Comet Encke: Meteor Metallic Ion Identification by Mass Spectrometer:R. A. Goldberg and A. C. Aikini ...............................

Ligmification in Trees: Indication of Exclusive Peroxidase Participation:J. MA. Harkin and J. R. Obst ...............................

Hich-Pressure Polymorph of Thulium: An X-ray Diffraction Study: L. Liu,W. A. Bassett. M. S. Liu ......................................

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Dlf'UADn 1.1 t2nlT RADRY (nnMMUNERBOARD OF DIRECTORS GLENN T. SEABORG LEONARD M. RIESER ROGER REVELLE HICHAliKlU Hi.

Retiring President, Chairman President President-Elect LEWIS M. BRANSCOMB EMILIO Q. DADDARIO

CHAIRMEN AND MATHEMATICS (A) PHYSICS (B) CHEMISTRY (C) AST-RONOMY (D)

SECRETAR IENA DLipman Bers Edwin M. McMillan Thomas E. Taylor Frank D. Drake

SECRETARIES OP F. A. Ficken Rolf M. Sinclair Leo Schubert Arlo U. Landolt

PSYCHOLOGY (J) SOCIAL AND ECONOMIC SCIENCES (K) HISTORY AND PHILOSOPHY OF SCIENCECarl P. Duncan Robert K. Merton Ernest Nagel

William D. Garvey Harvey Sapolsky Dudley Shapere

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Jacob E. Goldman Gordon Swanson Martin Cattoni William Heller

Jordan D. Lewis Phillip R. Fordyce Sholom Pearlman John Autian

DIVISIONS ALASKA DIVISION PACIFIC DIVISION SOUTHWESTERN AND ROCKY MOUNTAIN DIVISIO

Gunter E. Weller Irma Duncan John D. Isaacs Robert T. Orr J. Linton Gardner Marlowe G. Anderson

President Executive Secretary President Secretary-Treasurer President Executive Secretary

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Intracellular Plutonium: Removal by Liposome-Encapsulated Chelating Agent:Y.-E. Rahlmtlan, M. W. Rosenthal, E. A. Cerniy ....................... 300

Hyaluronate Inhibition of Chondrogenesis: Antagonism of Thyroxine, GrowthHormone, and Calcitonin: B. P. Toole .......................... 302

Blood Cells Preserved in a Mummy 2000 Years Old: M. R. Zimmerman ........ 303

Cyclic AMP Phosphodiesterase in Cloned Astrocytonia Cells: NorepinephrineIntduccs a Specific Enzyme Form: P. U.,-imov. tl. Al. Sl/wit,, B.. Weiv.s ... ..... 304

26-Hydroxyecdysone: New Insect Molting Hormone from the Egg of the TobaccoHornworm: J. N. Kaplanis et al.................................. 307

Octopamine-Sensitive Adenylate Cyclase: Evidence for a Biological Role ofOctopaimine in Nervous Tissue: J. A. Natlianisoln and P. Greengardl....... 308

Activation of Hemoglobin C Synthesis in Sheep Mlarrow Culture: J. W. Adlanlisonand G. Statnato'yannopoulos .................................... 310

Somnatonmedin: Inhibition of Adenylate Cyclase Activity in Subcellular Nlembranes ofVarious Tissues: G. P. E. Tell et al.. .......................... 312

Acetylcholine: Fast Axoplasmic Transport in Insect Chemoreceptor Fibers:R. Sc/lafer ............................ 315

Learning: Classical and Avoidance Conditioning in the NIollusk Pleurobranchaea:G. J. Alpitsos and W. J. Davis . ............................ 317

Selective VisuLal Experience Fails to NModify Receptive Field Properties of RabbitStriate Cortex Neurons: R. R. Afize and E. H. Auitrphly ................. 320

lechItical CoimOIC,entts: Preserve Guatemalan Teosinte, a Relict Link in Corn'sEvolution: W. C. Galitnat ......... ................... 323

AAAS/ CONACYTMEETING

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Preserved red blood cells, showingcharacteristic bioconcavity, in a tho-racic vein. The dark granules areautolyzed leukocytes. (Hematoxylinand eosin stain. ahbout x 1400). Seepage 303. [Michael R. Zimmerman,Hospital of the University of Pennsyl-vania, Philadelphia]

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