Makers of Electricity

BY

BROTHER POTAMIAN, F.S.C., D.Sc., Lond.
PROFESSOR OF PHYSICS IN MANHATTAN COLLEGE, N. Y.

AND

JAMES J. WALSH, M. D., Ph.D., LL.D.
DEAN AND PROFESSOR OF NERVOUS DISEASES AND OF THE HISTORY OF MEDICINE AT FORDHAM UNIVERSITY SCHOOL OF MEDICINE; PROFESSOR OF PHYSIOLOGICAL PSYCHOLOGY AT THE CATHEDRAL COLLEGE, NEW YORK