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MEMORY

A CONTRIBUTION TO EXPERIMENTAL

PSYCHOLOGY

BY

HERMANN EBBINGHAUS

PRIVAT DOCENT IN PHILOSOPHY AT THE UNIVERSITY OF BERLIN

(1885)

De subjecto vetustissimo

novissimam promovemus scientiam

TRANSLATED BY

HENRY A. RUGER, Ph.D.

ASSISTANT PROFESSOR OF EDUCATIONAL PSYCHOLOGY, TEACHERS

COLLEGE, COLUMBIA UNIVERSITY

AND

CLARA E. BUSSENIUS

PUBLISHED BY

Teachers College, Columbia University

NEW YORK CITY

1913