preparing the following pages the works of many authors have been drawn
from. In particular the writer acknowledges valuable assistance from:
Mines of South Africa," by G. F. Williams. "A Book of Precious Stones,"
by Julius Wodiska. "Precious Stones and Gems," by E. W. Streeter. "Gems
and Gem Minerals," by Dr. O. C. Far-rington. "Hand Book of Precious
Stones," by M. D. Rothschild. "Gem Cutter's Craft," by Leopold
is also under obligations for valuable assistance rendered by Mr.
Ernest G. H. Schenck, Mr. Ludwig Nissen, Mr. Henry Kryn, Mr. Lucien
Zell, Mr. Joshua W. Mayer, and to his son, Nelson H. Smith, for aid in
preparing the volume; and to Messrs. Schenck & Van Haelen for
original photographs of their cutting establishment; Mr. Julius Wodiska
for assistance and illustrations from "A Book of Precious Stones"; Mr.
Meyer D. Rothschild for assistance and illustrations from the mines of
the American Gem & Pearl Co.; J. B. Lippincott Co. for illustration
from W. R. Cattelle's book, "The Pearl"; G. P. Putnam's Sons for
colored illustration, "Emeralds from Muso Mine."