Notices respecting New Boohs. 185 



Die Grundlagen der Bewegungslehre. Von einem modernen Stand- 



punJcte aus dargestellt von Dr. Gr. Jauma^i*, Professor der PhysiJc 



an der Deutschen Technischen ffochsclu.de in Briinn. Mit 124 



Abbildungen. Leipzig : Johann Ambrosius Barth. 1904. 



Pp. vi+421. 



In almost every respect, this book differs markedly from the usual 



type of text-book on dynamics. It is au attempt to present the 



fundamental laws and principles of the subject in a thoroughly 



modern form. The author freely uses the vector calculus, following 



Gribbs in his method of treatment. The account which he gives of 



this subject is extremely condensed, and we fear that the beginner 



would be quite unable to follow it. To the advanced student the 



book may be recommended as a most interesting experiment in the 



modernization of one of the oldest branches of science. 



It is divided into three parts, the first dealing with the motion 

 of rigid bodies, the second with sound-waves, and the third with 

 the motion of deformable media. The treatment is everywhere 

 characterized by extreme compactness and generality : thus, Part I. 

 includes brief accounts of such subjects as planetary motion ; the 

 tides, &c. There is a certain amount of incongruity in many 

 portions of the book : any reader whose mental equipment is of a 

 sufficiently high order to enable him to study the book with profit, 

 will not be in any need of the surprisingly elementary information 

 which is sandwiched in between more or less advanced analysis, 

 involving applications of the higher parts of the vector calculus 

 and differential equations. Such readers may surely be supposed 

 to know the general construction of a barometer, cathetometer, 

 hydrometer, air-pump, &c, instruments not only referred to by the 

 author, but actually illustrated; but perhaps the author was of 

 opinion that a number of illustrations (without adequate description) 

 would serve to relieve the somewhat forbidding aspect of the 

 notation of the vector calculus. 



High-Temperature Measurements. By H. Le Chatelier and 

 O. Boudouard. Authorized Translation and Additions by 

 Gr. K. Burgess, D.Sc. Second Edition, Kevised and Enlarged. 

 New York : John Wilev & Sons. London : Chapman & 

 Hall. 1904. Pp. xv + 341. 

 The increasing importance of exact methods in pyrometry, not 

 only for purposes of scientific research, but for purely industrial 

 use, renders the appearance of this second edition of a well-known 

 and deservedly popular staudard work doubly welcome. The 

 revision of the new edition has, at Prof. Le Chatelier 's request, 

 been carried out by Dr. Burgess, and the work has been expanded 

 and enriched by numerous additions containing the results of 

 important recent researches — especially in the domain of optical 

 pyrometry. Prom a purely literary point of view, no doubt, im- 

 provements here and there would be desirable, as the translation is 

 in some instances too literal ; but one can afford to overlook trifling 

 defects in view of the very substantial service w r hich the translator 

 has rendered in placing within easy reach of English-speaking 

 students so admirable a treatise on a subject oi growing importance. 



