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Nature volume 88, page 513 (15 February 1912) | Download Citation



IN this “fourth edition” a revision has for the first time been undertaken. The consequent doubling of its size and price is fully justified by the enhanced value of the work, which for twenty years has been handicapped by its modfest size. The addition of eighty pages to the sectidn dealing with descriptive mineralogy has allowed a much fuller treatment of the ores, this portion being trebled in length, while ore-dressing processes (electromagnetic, oil-concentration, &c.), find brief reference under properties of minerals. The portion on optical properties, formerly relegated to a couple of pages, is enlarged sevenfold, thus permitting of an explanation of double-refraction phenomena. Coupled with the fuller description of rock minerals, this renders the book of some use in microscope work. The use of the letters a, b, C to indicate elasticity axes is regrettable, owing to the likelihood of confusion (both in writing and speaking), with the a, b, and c crystallographic axes; the substitution of X,Y,Z, as adopted in Iddings's “Rock Minerals,” avoids this difficulty.

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