PREFACE TO SECOND EDITION
Since the publication of the first edition of this book in 1919, the various topics contained in it have been also considered by me in The Concept of Nature (Camb. Univ. Press, 1920) and in The Principle of Relativity (Camb. Univ. Press, 1922). I hope in the immediate future to embody the standpoint of these volumes in a more complete metaphysical study.
A few notes have been appended to this edition to elucidate obscurities, and a few slips in the text have been corrected.
A.N.W.
TRINITY COLLEGE,
CAMBRIDGE
August, 1924