The Medicai Research Cen ter Brookhaven National Lab oratory Upton, L. L, New York 401846 Reprinted from RADIATION & AGEING pages 345-360, 1966 Proceedings of a Colloquium held in Semmering, Austria June 23-24, 1966 Edited by Patricia J. Lindop & G. A. Sacher mepositorny —2V4_ RECORDS coutection ZARSHALL ISLANDS BoxNe. {220/42 DEPT PUBLICATIONS Fo.ven #374 — 7290 Printed and Published by Red Lion Court, Fleet Street, London, E.C.4 1966 * 4, 4 es L a eee TAYLOR & FRANCIS LTD