Works by the same Author.

PROBLEMS OF LIFE AND

MIND.

The Foundations of a Creed. Two Volumes. Octavo. Per volume, $3.00.

CONTENTS: The Method of Science and its Applications to Metaphysics The Rules of Philosophizing - Psychological Principles The Limitations of Knowledge- The Principles of Certitude - From the Known to the UnknownMatter and Force Force and Cause-The Absolute in the Correlations of Feeling and Motion.

THE STORY OF GOETHE'S

Edition. $1.50.

LIFE. New One Volume. 16mo. With Portrait.

For sale by all Booksellers. Sent, post-paid, on receipt of price by the Publishers,

HOUGHTON, MIFFLIN & CO., BOSTON.

BOSTON AND NEW YORK:
HOUGHTON, MIFFLIN AND COMPANY.
The Riverside Press, Cambridge.

PREFACE.

THE title indicates that this volume is restricted to the group of material conditions which constitute the organism in relation to the physical world-a group which furnishes the data for one half of the psychologist's quest; the other half being furnished by historical and social conditions.

The Human Mind, so far as it is accessible to scientific inquiry, has a twofold root, man being not only an animal organism but an unit in the social organism; and hence the complete theory of its functions and faculties must be sought in this twofold direction. This conception (which has been declared "to amount to a revolution in Psychology"), although slowly prepared by the growing conviction that Man could not be isolated from Humanity, was first expounded in the opening volume of these Problems of Life and Mind; at least, I am not aware that any predecessor had seen how the specially human faculties of Intellect and Conscience were products of social factors co-operating with the animal factors.

In considering the Physical Basis a large place must be assigned to the mechanical and chemical relations which are involved in organic functions; yet we have to recognize that this procedure of Analysis is artificial and preparatory, that none of its results are final, none represent the synthetic reality of vital facts. Hence one leading object of the following pages has been everywhere to substitute the biological point of view for the