OBSERVATIONS CONCERNING
THE MENTAL DEVELOPMENT OF THE HUMAN BEING
IN THE FIRST YEARS OF LIFE

BY
W. PREYER
PROFESSOR OF PHYSIOLOGY IN JENA

TRANSLATED FROM THE ORIGINAL GERMAN
By H. W. BROWN
TEACHER IN THE STATE NORMAL SCHOOL AT WORCESTER, MASS.

NEW YORK
D. A P P L E T O N A N D C O M P A N Y

1895

Copyright, 1889,
BY D. APPLETON AND COMPANY.

[EDITOR'S PREFACE.]