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NEW BOOKS.
agents, but there is no mention of the important precautions in applying the paint, etc., whose neglect so often results in unsatisfactory or contradictory deductions. The following section deals wit11 the inorganic pigments. Some eighteen pages are devoted to \vhite lead and its manufacture. The authors adopt the theory of a chemical combination between white lead and linseed oil, a point that has been disputed b!. several investigators. T h e iron oxides, lead, chrome antl copper compounds, and the carbon pigments are described in turn. Under the head of organic pigments are I'russian blue antl the lakes of carmine, Brazil\\ 00~1.antl other animal antl vegetable colors, antl a number of the coal-tar d j ~ s . . I n account of indigo and some niinor organic pigments closes the volume. The work can be conitnendetl for \\hat it essays, to both the general reader and the chemist ivhose work is inainl>- in other departments. T h e space allottetl to tlie description of tlie various pigments appears, c n the \\.hole. to be fairly well distributed, though the paragraphs on the verinillionettes, red lead and asphalt coultl have been amnlified with advantage : on the other hand. the methods of chemical anal! sis of certain pigments might well have been omitted, since one competent to make such analyses always has access to detailed descriptions of the most recent and approved met hods . Thc book has a good index, and the print antl hintling are satis factory. FI
