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ENGLAND: BUTTERWORTH & CO. (PUBLISHERS) LTD. LONDON: 88 KINGSWAY, W.G.2 AFRICA: AUSTRALIA: CANADA: NEW ZEALAND: U.S.A.: BUTTERWORTH & GO. (AFRICA) LTD. DURBAN: 33/35 BEACH GROVE BUTTERWORTH & CO. (AUSTRALIA) LTD. SYDNEY: 6/8 O'CONNELL STREET MELBOURNE: 430 BOURKE STREET BRISBANE: 240 QUEEN STREET BUTTERWORTH & GO. (CANADA) LTD. T O R O N T O : 1367 DANFORTH AVENUE, 6 BUTTERWORTH & CO. (NEW ZEALAND) LTD. WELLINGTON: 49/51 BALLANCE STREET AUCKLAND: 35 HIGH STREET BUTTERWORTH INC. WASHINGTON, D.G.: 7235 WISCONSIN AVENUE, 14 BUTTERWORTH & CO. (PUBLISHERS) LTD. 1961 P R I N T E D IN GREAT B R I T A I N BY H E A D L E Y B R O T H E R S LTD I 0 9 K I N G S W A Y L O N D O N W C 2 A N D A S H F O R D KENT