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PERGAMON PRESS LTD. Headington Hill Hall, Oxford 4 & 5 Fitzroy Square, London W.l PERGAMON PRESS INC. 122 East 55th Street, New York 22, Ν Y. GAUTHIER-VILLARS ED. 55 Quai des Grands-Augustins, Paris, 6 PERGAMON PRESS G.m.b.H. Kaiserstrasse 75, Frankfurt am Main Copyright © 1962 PERGAMON PRESS LTD. First published 1962 Second (revised) impression 1964 Library of Congress Card Number 61-12437 S e t i n T i m e s N e w R o m a n 1 0 o n 1 2 p t . a n d P r i n t e d i n G r e a t B r i t a i n PAGE BROS. ( N O R W I C H ) L T D .