3, is another good general work on gems. Its
color plates of rough gem minerals are especially good.

Those who are especially interested in the diamond should see _The
Diamond_ by W. R. Cattelle, The John Lane Co., N. Y., which gives a good
account of its subject and is rich in commercial information, or
_Diamonds: A Study of the Factors which Govern their Value_, by the
present author, G. P. Putnam's Sons, N. Y., 1914.

Sir Wm. Crook's, the _Diamond_, Harper & Bros., N. Y., is very
interesting, especially in its account of the author's visits to the S.
African mines.

Students of pearls will find _The Book of the Pearl_, by Dr. Geo. F.
Kunz and Dr. Chas. Stevenson, Century Co., N. Y., very complete. A
smaller work, yet a good one, on pearls is _The Pearl_ by W. R.
Cattelle, J. B. Lippincott & Co., Phila., 1907. This book is strong on
the commercial side.

An older work is _Pearls and Pearling_ by D. Edwin Streeter, Geo. Bell &
Co., London.

A work on gems and gem-cutting by a practical cutter is _The Gem
Cutter's Craft_, by Leopold Claremont, Geo. Bell & Sons, London, but it
should be said that very few trade secrets will be found exposed in the
book.

On the subject of scientific precious stones _The Production and
Identification of Artificial Precious Stones_, by Noel Heaton, B.Sc.,
F.C.S., read before the Royal Society of Arts, Apr. 26, 1911, is very
fine. It may be had in the annual Report of the Smithsonian Institution
for 1911, p. 217. It gives one of the best accounts to be had of the
history of the artificial production of precious stones, especially of
the corundum gems. It also contains a splendid account of how to
distinguish scientific from natural gems.

Most students of gems will need to refer frequently to some good
text-book of mineralogy. Although old, Dana's _Mineralogy_ is still a
standard work. A newer book and one of a more popular nature is L. P.
Gratacap's _The Popular Guide to Minerals_, D. Van Nostrand & Co., N. Y.

Among larger and more expensive books on gems may be mentioned _Precious
Stones_, by Dr. Max Bauer. This is an English translation of a German
work which is a classic in its field. As it is now out of print in its
English edition, a somewhat detailed account of its character may be of
value to those who may be inclined to go to the effort to seek a copy at
a public library or perhaps to purchase one through second-hand book
stores.

A popular account of their characters