FRANK B. WADE, B.S.

HEAD OF THE DEPARTMENT OF CHEMISTRY, SHORTRIDGE HIGH
SCHOOL, INDIANAPOLIS, IND.
AUTHOR OF "DIAMONDS: A STUDY OF THE FACTORS THAT
GOVERN THEIR VALUE"

ILLUSTRATED

G. P. PUTNAM'S SONS
NEW YORK AND LONDON
The Knickerbocker Press

First printing, January, 1918
Second " March, 1924

Made in the United States of America