THE PROLONGATION OF LIFE
Reading edition
OPTIMISTIC STUDIES
BY
ÉLIE METCHNIKOFF
SUB-DIRECTOR OF THE PASTEUR INSTITUTE, PARIS
THE ENGLISH TRANSLATION
EDITED BY
P. CHALMERS MITCHELL M.A., D.SC. OXON., HON. LL.D., F.R.S. Secretary of the Zoological Society of London; Corresponding Member of the Academy of Natural Sciences of Philadelphia
G. P. PUTNAM’S SONS NEW YORK & LONDON The Knickerbocker Press 1908