What is Electricity By John Trowbridge. "International
Scientific Series." (Kegan Paul and Co.)—Professor Trowbridge, of Harvard, is to be congratulated on his lucid and careful exposi- tion of electrical theories. Any one with a slightest acquaintance with science can appreciate his able review of the typical theories of, say, Maxwell, Helmholtz, Neumann, Ampere, and Gauss. The steps by which electricity and electro-magnetism have revealed their wonders to us are discussed in the several chapters on the galvanometer, the dynamo, transformations of energy, the Leyden Jar, and every aspect of electricity which can help us to estimate its nature. Professor Trowbridge's volume comes at an opportune moment ; one of the last chapters briefly discusses the " X " rays, which raise anew the great questions of matter, the actual con- stitution of ether, and the connection between light and electricity.
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