Notices respecting New Books. 517 



disappears only to reappear opposite another stria generally 

 nearer the cathode. Two or sometimes three of these bands 

 may be visible at the same time ; they at length disappear 

 altogether, being most frequent in tubes recently made. 



In conclusion I offer my best thanks to Prof. Thomson for 

 the great help I have derived from his valuable suggestions, 

 and also to Mr. E. Everett for his assistance with some of 

 the glass-work. 



Cavendisli Laboratory. 



A 



XLV. Notices respecting New Books. 



Annuaire pour Van 1901, public par le Bureau cles Longitudes, 

 Avec cles Notices scientifiques. Paris : G-authier-Villars. 

 S usual, this handy little annual contains a mass of useful infor- 

 mation, and will be welcomed by the engineer and the man of 

 pure science alike. Among the specially contributed articles for 

 the present year we notice " The Electric Transmission of Energy," 

 by M. A. Cornu ; " The Projected Revision of the Meridional 

 Arc of Quito," by M. H. Poincare ; and the historical notice re- 

 garding the "Establishment of the Metric System," by M. Bassot. 

 At the modest price of 1 fr. 50 c, the volume, which contains close 

 on 800 pages 8vo, is a marvel of cheapness. 



The Electro- Chemist and Metallurgist. A monthly journal devoted 

 to Electro-Chemistry and Metallurgy. Vol. I. No. 1. January 

 1901. London : Messrs. Sherard Cowper-Coles & Co., Ltd. 

 We heartily welcome the appearance of this new journal, which 

 will undoubtedly fill a gap in English technical literature. The 

 rapid strides which electro-chemistry and electro-metallurgy have 

 been making within recent years are sufficiently remarkable to 

 justify the assumption that before very long a number of the older 

 chemical processes will be superseded by electro-chemical ones. 

 In view of the importance of the subject, it seemed somewhat 

 strange that there should in the English language have been no 

 periodical devoted to electro-chemistry. The journal under review 

 makes a very good start : it contains a number of highly interesting 

 articles by well-known specialists, and, as an extremely important 

 feature, we may note the illustrated abstracts from contemporary 

 foreign journals. If the 'Electro-Chemist and Metallurgist' 

 maintains the remarkable combination of high-class contributions 

 and extremely moderate price with which it starts, we have no 

 doubt that it will achieve the success which it certainly deserves. 



The Periodic Classification and the Problem of Chemical Evolution. 



By George Budore, B.Sc. London : Whittaker & Co., 1900. 

 Messrs. Whittaker have recently been publishing a series 

 of small text-books devoted to special scientific and technical 

 problems, and the book before us forms the latest addition to the 



