﻿1058 Notices respecting New Books. 



has been based mainly on the requirements of chemists, physicists 

 will also find it of pre-eminent value as a work of reference, to 

 which they can turn for information on all the chemical topics 

 which are covered by the title. 



Science in the Service of Man : Electricity. By Sydney G„ 

 Starling. (Longmans Green & Co., 1922 ; price 10s. 6d. net.) 



The object of this book is to give the general reader an account 

 of the present stage of electrical knowledge. 



After a brief historical sketch the industrial applications are 

 dealt with, such as the electro-magnet, dynamo, electro-motor, 

 telegraph, telephone and alternating current transformer. 



Later chapters deal with electrolysis, discharge of electricity 

 through a gas, X-rays, radioactivity, the electro-magnet theory 

 and wireless telegraphy. 



The treatment throughout is entirely non-mathematical. A 

 book suitable as a school prize for a boy who delights in making 

 tilings for himself, as a welcome change from the schoolmaster's 

 favourites, Scott's Poetical Works, or Macaulay's History of 

 England. 



Some dismal X-ray photographs of surgical interest cast a 

 gloom; otherwise much of the apparatus illustrated is simple 

 enough for a boy to make for himself. 



La theorie Einsteinienne de la Gravitation. Essai cle vulgari- 

 sation cle la theorie. Par Gtistave Mie. (Paris : J. Hermann, 

 1922.) 



This is a translation, by J. Eossignol, from the German in the 

 Deutsche Rundschau, and it is addressed in book form of 100 

 pages to a public not supposed to be acquainted with higher 

 mathematics, but none the less capable of appreciating the 

 precision and clarity of the Relativity Theory. 



It will serve as an introduction to the more extended treatment 

 of Eddington's ' Relativity,' and it is an eloquent presentation in. 

 popular language of the new ideas that arise in a discussion in. 

 general company at the present day. 



Wave-lengths in the Arc Spectra of Yttrium, Lanthanum, and 

 Cerium and the preparation of pure rare Earth Elements. 

 Bureau of Standards, Government Printing Office, Washington- 

 Scientific Papers. JNo. 421. 



This paper is a continuation of the work already undertaken on 

 the mapping of the red and infra-red spectra of the chemical 

 elements. The results for about 35 elements have so far been, 

 published, and here the results of the study of the arc spectra of 



