ELEMENTS OF OPTICAL MINERALOGY, an Introduction to Microscopic Petrography, Part II. DESCRIPTION OF MINERALS with Special Reference to their Optic and Microscopic Characters. Third Edition. Alexander N. Winchell. Pp. XVIII, 459, fig. 362. John Wiley & Sons, Inc., New York. 1933. Price $6.00 net.

ON THE MINERALOGY OF SEDIMENTARY ROCKS. A series of essays and a bibliography. P. G. H. Boswell. IX+393 pages. Thomas Murby & Company, London. Price 21 shillings.

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