LIPPINCOTT’S
EDUCATIONAL SERIES
EDITED BY
MARTIN G. BRUMBAUGH, Ph.D. LL.D.
PROFESSOR OF PEDAGOGY, UNIVERSITY OF PENNSYLVANIA, AND COMMISSIONER
OF EDUCATION FOR PUERTO RICO
VOLUME I
Lippincott Educational Series
EDITED BY DR. M. G. BRUMBAUGH
Professor of Pedagogy, University of Pennsylvania