The Principles of Mechanics Presented in a New Form. By
Heinrich Hertz, late Professor of Physics in the University of Bonn. With an Introduction by H. von Helmholtz. Authorised English Translation by D. E. Jones, B.Sc., and J. T. Walley, M.A. - (Macmillan and Co. 10s. net.)—This is the third and last volume of the English edition of Hertz's collected works: the two former ones containing his work on "Electric Waves" and his "Miscellaneous Papers" respectively. He was the favourite pupil of Von Helmholtz, who encouraged him to take up the study of electrodynamics, which he prosecuted with great success, and from which he proceeded to the investigations comprised in the volume before us. But he died at the early age of thirty- six, greatly regretted by his friends and colleagues, and especially by Von Helmholtz himself, who did not long survive him. The book itself is too technical for us to review in detail ; but it is one which no student of the laws of motion can afford to neglect.
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