Another large and thoroughgoing work is Gardner F. Williams' _The Diamond Mines of South Africa_, MacMillan, N. Y. Dr. Geo. F. Kunz's _Gems and Precious Stones of North America_, The Sci. Pub. Co., N. Y., 1890, 336 pages, 8 colored plates (excellent ones too), many engravings, is a very complete account of all published finds of precious stones in the United States, Canada, and Mexico, giving a popular description of their value, history, archeology, and of the collections in which they exist, also a chapter on pearls and on remarkable foreign gems owned in the United States. Many rare and little known semi-precious stones are described here. Dr. Kunz is also the author of several more recent gem books notably _The Magic of Jewels and Charms_ and _The Curious Lore of Precious Stones_, Lippincott, Phila. Among books on engraved gems is the old _Hand Book of Gem Engraving_ by C. W. King; Bell & Daldy, London, 1866, and one by Duffield Osborne; Henry Holt & Co., N. Y. Another book on this subject is _Engraved Gems_ by Maxwell Somerville; Drexel Biddle, Phila. For those who wish still further references the following older works will prove interesting. _Precious Stones_, by W. R. Cattelle; Lippincott, Phila. _Precious Stones_, by W. Goodchild; D. Van Nostrand & Co., N. Y. Julius Wodiska, of New York, has also written an interesting work on precious stones, _A Book of Precious Stones_, Putnam's, 1907. Still older works are _Precious Stones and Gems_ by Edwin W. Streeter; Chapman & Hall, London, 1877. This is a book of 264 pages with nine illustrations. It contains much of value and was unsurpassed in its day. Its first-hand accounts of numerous important, even celebrated diamonds and other precious stones will always make it valuable to the student of gems. Another book by the same author is _The Great Diamonds of the World_; Geo. Bell & Sons, London, 1882; 321 pages. Not illustrated. Its title adequately describes its contents. It is an excellent work. The author even traveled in India tracing the history of some of the famous diamonds that he describes. _Diamonds and Precious Stones_, by Louis Dieulafait published in its English translation by Scribner, Armstrong & Co., N. Y., 1874, is another old but interesting work. It has 292 pages and 126 engravings on wood. It gives a fine account of diamond cutting as practiced at that time. There is also an excellent history of the production of artificial precious stones to that date. _The Natural History of Precious Stones and of the Precious Metals_ by C. W. King, M.A., Bell & Daldy, London, 1870, is rich in references to classical literature.