D.
Dana, Dr. George Frederick Kunz, Professor Oliver Cummings Farrington,
Mr. Edwin W. Streeter, Mr. Gardner F. Williams, Professor Louis P.
Gratacap, Mr. Wirt Tassin, and Mr. W. E. Cattelle. Thanks for valuable
aid are also due to Mr. Arthur Chamberlain, editor of The Mineral Collector; to the editors of The Jeweller's Circular-Weekly, The Keystone, and The 'National Jeweller; to
The Foote Mineral Company and Mr. William H. Rau, of Philadelphia; to
Mr. John Lamont, to Mr. Albert H. Petereit, and Mr. Ludwig Nissen of
New York City; to Mr. Walter Scott Perry of Brooklyn, and to the
University of California.
The
author feels that the experience of more than thirty years as artisan
and as manufacturer of jewelry and importer of gems justifies him in
presenting in book form the information which is constantly sought of
those who are regarded as authorities upon the subject of precious
stones.
J. W.
New York, June, 1909.
