SCIENCE

2 August 1957,Volume 126, Number3266 AMERICAN ASSOCIATION FORTHE ADVANCEMENTOF SCIENCE Board of Directors LAURENCEH. SNYER, Presidentrtid WALLAcE R. BRODE, President Elect PAUL B. SEARS, Retiring President Since PAUL M. GROSS onthe ra GEORGE R. HARRISON marked PAUL E. KLOPSTEm CHAUNCEY D. LIAzE correspoi MARGARET MEAD necessary THOMAS PARK Durinl ................
................