Book Reviews

Book reviewed in this article: Essentials of Electricity, Direct Currents, by W. H. Timbie, Wentworth Institute, Boston . Essentials of Physics, by George A. Hill, Howard College . A Text‐Book of Physics, by S. E. Coleman, High School, Oakland, Calif . A History of Chemistry, from the Earliest Times Till the Present Day, by the late James C. Brown, University of Liverpool . Mineral Science; A Study of Inorganic Nature. A Pupils' Exercise Book to accompany, by Miner H. Parrock, A. M., Head Teacher, Departments of Chemistry. Photo‐Science, and Physiography, Technical High School, Providence R. I . Who's Who in Science, edited by H. H. Stephenson, Chemist Royal Doulton Potteries, Lambeth, England . Genetics. An Introduction to the Study of Heredity, by Herbert E. Walter, Brown University . Physical Laboratory Guide by Frederick C. Reeve, Academy, Newark, N. J . Heat, A Manual for Technical and Industrial Students, by J. A. Randall, Pratt Institute, Brooklyn . Principles of Economic Zoology, by L. S. Dougherty, M. S., Ph. D. Professor of Zoology, State Normal School, Kirksville, Mo., and M. C. Daugherty, Kirksville, Mo . College Zoöology, by Robert W. Hegner, Ph. D., Assistant Professor of Zoölogy in the University of Michigan . Microscopy and the Microscopical Examination of Drugs by Charles E. Gabel, B. S., Ph. D., Microscopical Food and Drug Analyst, Iowa State Dairy and Food Commission . Agricultural Education in the Public Schools, by Benjamin Marshall Davis . The Soil Solution, by Frank K. Cameron .