DEVELOPMENT 



AND 



EVOLUTION 



INCLUDING 



PSYCHOPHYSICAL EVOLUTION, EVOLUTION BY 



ORTHOPLASY, AND THE THEORY OF 



GENETIC MODES 



BY 



JAMES MARK BALDWIN 



Ph.D. Princeton, Hon. D.Sc. Oxon., LL.D. Glasgow 

 STUART PROFESSOR IN PRINCETON UNIVERSITY 



THE MACMILLAN COMPANY 



LONDON: MACMILLAN & CO., Ltd. 



I917 



All rights reserved 



