NEW YORK: G. P. PUTNAM'S SONS BOMBAY, CALCUTTA, MADRAS: MACMILLAN AND CO., LTD. TORONTO: J. M. DENT AND SONS, LTD. TOKYO: THE MARUZEN-KABUSHIKI-KAISHA All rights reserved PRINCIPLES BY JAMES WARD SC.D. (CANTAB.), HON. LL.D. (EDIN.), HON. D.Sc. (Oxon.) FELLOW OF THE BRITISH ACADEMY FOREIGN MEMBER OF THE NEW YORK ACADEMY AND OF THE DANISH ROYAL SOCIETY AND PROFESSOR OF MENTAL PHILOSOPHY, CAMBRIDGE SECOND EDITION Cambridge at the University Press 1920 |