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INDIA RUBBER, GUTTA PERCHA AND BALATA. By William T. Brannt. Philadelphia, Pa. : Henry Carey Baird. 1900. 12mo. Pp. 328. Price 3.50. The present volume deals with the occurrence, geo graphic distribution and cultivation of rubber plants the manner ot obtaining and preparing the raw mate rials, modes of working and utilizing them including washing, loss in washing, maceration, mixing and vul canizing rubber and gutta percha compounds. The lit-srature upon the rubber industry is so extremely limited that any work devoted to it is doubly welcome, even if it were not of the valuable nature of the present book. A careful examination of the book phows that the informa tion contained in it ie of great value and deals with the subject of experimenting upon rubber on a considerable scale. The publishers will send the book postpaid to any address in the world. ETHNOLOGY. By Dr. Michael Hober-landt. London: J. M. Dent & Com pany. New York: The Macmillan Company. 1900. 16mo. Pp. 169. Price 40 cents. One of the Temple Primers, which provide in con venient and accessible form the information which is usually only conveyed by bulky, high-priced cyclopedias. It is an admirable idea and the volume before us is an excellent example of good and cheap bookmaking. The text is good. INORGANIC EVOLUTION AS STUDIED BY SPECTRUM ANALYSIS. By Sir Nor man Lockyer, K.C.B., F. R.S. Lon don and New York: The Macmillan Company. 1900. 8vo. Pp. 198. Price 1.75. The author occupies an unique position in the scientific world and anything from his pen is sure to be excellent. The present volume contains an account of the authors most recent inquiries into the chemistry of the stars, and of some questions which have grown out of these ln-qniries. It is an important treatise concerning the evo-lntionof the chemical elements; and points oat espe cially that the first steps in this evolution may possibly be best stndied by and most clearly represented hi the long chain of facts now at our disposal toncbing the spec tral changes observed in the hottest stars.

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