11 April 1975Volume 188, No. 4184

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LETTERS The Ethics of Experimentation: A. R. Jon.tsen; P. Lowinger; InefficientMedical Care: S. Raymtiond; Honeybee Controversy: R. Rosin;Political Decision: A. Shapiro ........................................

EDITORIAL Coercive Power of the Federal Purse: K. Brewster ........................

ARTICLES Evolution at Two Levels in Humans and Chimpanzees: M.-C. King and A. C. Wilson. .

Stratospheric Ozone Dest,ruction by Aircraft-Induced Nitrogen Oxides:F. N. Alyea, D. M. Cunnold, R. G. Prinn ...........................

Technology Observed: Attitudes of a Wary Public: T. R. La Porte andD. Metlay ................................................

NEWS AND COMMENT

RESEARCH NEWS

BOOK REVIEWS

Iran: Trying to Buy Academic Parity with the West .......................Beyond Vladivostok: The Feasibility and the Politics of Arms Reductions ........Intensive Care for Newborns: Are There Times to Pull the Plug? ...............Offshore Oil: Supreme Court Ruling Intensifies Debate .......................

Energy: Washington Gets a New Proposal for Using H-Bombs ...............Hepatitis B: A New Vaccine Ready for Human Testing....................

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Sex and Evolution, reviewed by E. 0. Wilson: DNA Synthesis, R. D. Wells;Gene Expression, G. Wilcox; Topics in Carbon-13 NMR Spectroscopy,J. A. Magnuison; Amorphous and Liquid Semiconductors, D. Adler;Water and Aqueous Solutions, D. Eisenberg; The Major TernaryStructural Families, A. Wold; Books Received ............................... 139

BOARD OF DIRECTORS ROGER REVELLE MARGARET MEAD WILLIAM D. MC ELROY RICHARD H. BOLT EMILIO Q. DADIARIORetiring President. Chairman President President-Elect KENNETH B. CLARK EDWARD E. DAVID, JR

CHAIRMEN AND MATHEMATICS (A) PHYSICS (B) CHEMISTRY (C) ASTRONOMY (D)SECRETARIES OF Victor L. Klee Victor F. Weisskopf William E. Hanford Carl SaganTruman A. Botts Rolf M. Sinclair Leo Schubert Arlo U. Landolt

AAA$ SECTIONSPSYCHOLOGY (J) SOCIAL AND ECONOMIC SCIENCES (K) HISTORY AND PHILOSOPHY OF SCIENCE (L) ENGINEERINGRichard C. Atkinson Seymour M. Lipset Roger C. B:uck Edward Wenk, JrEdwin P. Hollander Daniel Rich George Basalla Paul H. Robbins

EDUCATION (Q) DENTISTRY (R) PHARMACEUTICAL SCIENCES (S) INFORMATION, COMPUTING, AND COMMUNICATF. James Rutherford Clifton 0. Dummett James T. Doluisio Martin GreenbergerPhillip R. Fordyce Sholom Pearlman Raymond Jang Joseph Becker

DIVISIONS AlASKA DIVISION PACIFIC DIVISION SOUTHWESTERN AND ROCKY MOUNTAIN DllWilliam E. Davis Irma Duncan George A. Zentmyor Robert T. Orr Joseph A. Schufie Max P. DunfordChairman, Executive Committee Executive Secretary President Secretary-Treasurer President Executive Officer

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REPORTS Vaporization of Solids: Evidence for a Zipper Mechanism in the RetardedVaporization of Arsenic: C. A. Hiiltma(n and G. M. Rosenblatt .................145

Laurentide Ice Sheet Meltwater Recorded in Gulf of Mexico Deep-Sea Cores:J. P. Ken1nett and N. J. Shackletoni .. ...................................... 147

Submarine Barite-Opal Rocks of Hydrothermal Origin: K. K. Bertine andJ. B. Keene .............................................. 150

Electron Spin Resonance for Detecting Polyadenylate Tracts in RNA's:A. M. Bobst, 7. K. Sinha, Y.-C. E. Pan ...................................153

Light-Induced Changes in the Structure of Pigmented Granules in AplysiaNeurons: M. Henkart ......................................... 155

PhototransduCtion in Aplvsia Neurons: Calcium Release from PigmentedGranules Is Essential: A. M. Brown, P. S. Bair, Jr., F. H. Tiley, Jr.............157

Partial Amino Acid Sequence of the Precursor of Immunoglobulin Light ChainProgrammed by Messenger RNA in vitro: 1. Schechier et al ............... 160

Solar Nitrogen: Evidence for a Secular Increase in the Ratio of Nitrogen-15to Nitrogen-14: J. F. Kerridge ............................................ 162

Yeast Chromatin SuLbullit Structure: D. Lohr and K. E. Vani Holde ................... 165

Fever and Survival: M. J. Kliuger, D. H. Rinigler, M. R. Aner ..................... 166

Techniiccal Co0mminen1ts: HeLa Cells and RT4 Cells: L. M. Franks and C. Rigby;W. A. Nelson-Ree.s ........................................... 168

Trace Metals Analyzer; Dilutor-Dispenser: Spectrophotometer Calibration;Electronic Balance; Universal Test Stand; Colorimeter; Nuclear MagneticResonance Spectrometer; Still; Recorder-Logger; Fraction Collector;Literature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Chimpanzee (Pan troglodytes troglo-dytes). Although chimpanzees differsubstantially from humans in anatomyand way of life, the proteins and DNAof the two species differ no more thando those of sibling species. See page107 [Part la of plate It by PierreDandelot, Paris Museum of NaturalHistory; from A Field Guide to theLarger Manmmals of Africa by JeanDorst, Houghton Mifflin Company,19701

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