The artifieial formation of minerals opens another line of research upon which umeh vain• able work has been done by Danbri"•e. Fouqu6. 1)1iehel Levy. Friedel, Bourgeois. :Meunier. and others.
llmmormAritv. Among valuable works on gen eral mineralogy may bo mentioned: Bonerman. Text-Book of Deseriptire Mineralogy (London.
1884) ; D. Dana. Nystem of Mineralogy Oth ed., New York, 1592) ; E. S. Dana, Text-Book of Mineralogy (New York, 1508) Des eloizeaux, Manuel de mine'ralogie, with atlas (vol. i., Paris. 1862; vol. ii., part i., 1874) : Tschermak. Lehr birch der Mineralogie (Vienna. 1553). Of a rather more elementary nature but of consider able value to the student of mineralogy are: Moses and Parsons, Min, ralogy, Crystallography, and Blowpipe .ana/ysis (New York, 1900) : E. S. Dana. Minerals and 11ou• to Study Them (1595).
In addition to the above the following works are especially devoted to crystallography and physical mineralogy: 'Mallard, Trait(' de crystal lographic giometrique et physique (Paris. vol. i., 1s79: vol. ii., 15s4) Story-Alaskelyne, lography: The .11a•pholoyy of Crystals (London, 1,95) ; Lira/ is of Crystallography New York. 1591) : Groth, Phy.sikuli.sche Krys tallographie (Leipzig. 1594-95) ; Liebisch, Geo riNehr K rySt11110gra ib., 1581) id..
Physikalischc Krystallographie 1891) : loses. character of Crystals (New York. 1899).
Valuable text-books on determinative mineral ogy are: Brush, D. fermi:lathe(' Mineralogy and Blowpipe Analysis (ed. by Penfield. New York, 1,96): Endliclr, Manual of Qualitative Blowpipe Analysis (New York, 1592).
Of value in the study of minerals in rock sections are: Potsenbusch. Mikroskopisehe Physio gra phi(' pet rogra ph isch wich t igen. .11 inera kn. (Stuttgart. 1873; 3d ed. 1592). translated and abridged by Iffilings (New York. 1155) Luquer, Minerals in Rork. Sections (New York, 1898).
The following works are useful for reference on subjects connected with economic mineralogy: Dewey. I'r•eliminary Deseriptive Catalogue of the Systematic Collections in Economic Geology nail Metallurgy in the United Status National Mu seum (Bulletin 42, United States National Mu seum, Washington. 1891) ; Merrill, Guide to the Study of the Colhetions in thc Section of Applied Geology: The .Von-Mctallic Minot-0g (United States National Museum. Washington, 1900: Bothwell and Struthers. The Mineral Industry (New York, annually. 1592 et seq.).
In addition to these the reader is referred to the volumes on Mineral h(soucceR of the raited States, published by the United States Geological Survey (Washington. 1552 et seq.).