S^=S=^^=^SSSSS2^=SSSSSSS =^= SBBBBg SCIENCE v4 weekly journal for scientists in all fields, reporting today's research and its impact on society. Now in its i2jth volume j Science is published by the American Association for the Advancement of Science. Each issue contains: Editorials Articles News of Science Book Reviews Reports Departments Comments writers. on current affairs by the editors and guest Reviews and discussions by leading scientists and scholars. The range includes reviews of the state of knowledge in the physical, biological, and behavioral sciences; discussions of science in the government, in public affairs, and in education; and research in the history and philosophy of science. A review of recent developments affairs. in science and public Authoritative appraisals of new scientific books by writers who are experts in the fields of the works reviewed. Brief technical accounts of new experimental cal findings by the investigators. and theoreti- of scientific societies and Letters to the editor, reports meetings, equipment news. $8.50 a year > 35$ a copy. Postage 75^ to Canada > $1.50 to other countries. The AAAS membership dues of $ 8.50 include a subscription to Science. 1515 Massachusetts Washington 294 5, D. C. Avenue, NW BSBBg