Based on lectures delivered at Princeton University 



Under the Louis Clark Vanuxem Foundation 



February 24, March 1, 8, 15, 1916 



COPYRIGHT, 1916, BY PRINCETON UNIVERSITY PRESS 

 PUBLISHED OCTOBER, 1916, AS "A CRITIQUE OF THE THEORY OF EVOLUTION' 



SECOND PRINTING, SEPTEMBER, 1917 

 THIRD REVISED PRINTING, FEBRUARY, 1919 



COPYRIGHT, 1925, BY PRINCETON UNIVERSITY PRESS 

 SECOND EDITION, SEPTEMBER, 1925 



PRINTED AT PRINCETON UNIVERSITY PRESS, PRINCETON, N.J., LT.S.A 



