SUPPLEMENT TO AN INTRODUCTION TO SEDIMENTARY PETROGRAPHY. Henry B. Milner. 156 Pages, 12 Plates. Thornas Murby & Co., 1, Fleet Lane, E. C. 4, London, 1926; D. Van Nostrand Co., 8 Warren St., New York.

A GUIDE TO THE COLLECTION OF METEORITES. G. T. Prior. Printed by order of the Trustees of The British Museum and sold at The British Museum, Cromwell Road, S. W. 7, London, 1926. Price sixpence.

UEBER DIE SYNTHESE DER FELDSPATVERTRETER. (The Synthesis of the Feldspathoids). W. Eitel. Preisschriften gekrönt und herausgeigeben von der Fürstlich Jablonowskischen Gesellschaft zu Leipzig. LII. vii+258 pp.+50 Figs. 4 plates. Akademische Verlagsgesellschaft m. b. H., Leipzig, 1925, 25 Marks.

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