A quarter of a century ago struggling with problems of descent amid Amazonian forests and on Andean heights a friend in Europe to whom I had communicated some of my questionings of current theories sent me a few numbers of a periodical— Roux's Entwicklungsmechanik der Organismus, where to my joy I found biologists attempting to solve some of my problems along experimental lines—among them and perhaps above them all was Hans Driesch, now Professor of Philosophy at Leipzig. Thus well disposed I came to a book on psychology by a biologist and philosopher, the author of the 1914 Gifford Lectures, heightened by his complimenting psychology, in whose puzzles I am daily involved, as the most important and the most promising of all sciences at the present time.

But the compliment loses substance when you find that the author has only an amateurish knowledge of a science upon which he has lectured at Pekin, Nankin, Tokio and Columbia University (the present volume reproduces these lectures).