[ 819 ] 



LXXIX. Notices respecting New Boohs. 



Gesammelte Abhandlunrjen von Friedrich Kohlbausck. Edited by 

 Wilhelm Hallwachs, Adolf Heylweiller, Karl Strecker, 

 and Otto Wiener. First volume. "With a portrait of the 

 Author. Pp. xxxv + 1108. (Leipzig: J. A. Barth, 1910.) 



THIS collected edition of the scientific papers of the late Dr. 

 Kohlrausch represents his life-work. His last manuscript 

 was finished scarcely two weeks before his death in January 19 1U, 

 and during the previous Christmas-time he had been planning 

 fresh work in collaboration with Dr. Griineisen. No more fitting 

 monument then could be erected to him than that formed by 

 bringing together his various contributions to science. The pre- 

 sent volume includes only the first portion of his numerous inves- 

 tigations, viz. those dealing with Electricity, Heat, Optics, absolute 

 electrical measurements, and miscellaneous topics. The second 

 volume will contain his papers on Electrolysis. In each of the 

 above subjects the separate papers are in general arranged in the 

 order of their first appearance ; a list of the papers in this order 

 serves as a general index. A second list is included, giving all his 

 papers in order of appearance. The number of each page of the 

 journal, in which any part originally appeared, is given by a 

 number inserted in square brackets in the text ; so that a 

 reference to the original can be quoted from this collection itself. 

 A glance through this collection is sufficient to remind one of 

 the important part which Kohlrausch has played toward making 

 physics into an exact science. Probablv the most noteworthy of 

 his contributions under this head are those on the electrochemical 

 equivalent of silver (pp. 663-726) and on the absolute value of 

 the electrical condudivit}^ of mercury (pp. 763-885). Both of 

 these investigations reveal the nature of the man. Of work of a 

 less precise nature we may cite his investigations on " elastische 

 Xachwirkung," occupying practically the whole of the first 162 

 pagf^s of this volume and including his earliest published work. 

 These are only particular instances ; his varied activities will be 

 better gauged from the statement that 113 separate productions 

 are quoted in this volume alone. Every physical investigator will 

 be glad to have them in their collected form. 



Outlines of the Theorj/ of Electromagnetism. By Gtlbeet T. 

 Walker, M.A., Set)., F.B.S. Pp. 52. Cambridge University 

 Press, 1910. 3s. nett. 



This small book consists of a summary of a series of lectures 

 delivered before the Calcutta University. It does not claim to 

 any originality except in the mode of presenting the subject. It 

 forms a most convenient outline of the subject on vectorial lines. 

 The first chapter is as useful an introduction to vector analysis as 



