Chemistry and Physics. 499 



particularly with technical analysis, for instance, the examina- 

 tion of acids and alkalies, alloys, soaps, paints, coal, rubber, 

 gases, waters, etc. 



It appears that all practical analytical chemists should find 

 this work very useful. h. l. w. 



3. Outlines of Theoretical Chemistry; by Frederick H. 

 Getman. 8vo, pp. 625. New York, 1922 " (John Wiley & 

 Sons, Inc.). This is the third edition of this well-known text- 

 book. A large part of the preceding edition has been rewritten, 

 and much new material has been added on account of the recent 

 advances in the science of physical chemistry. It is an excellent 

 advanced presentation of the subject and it treats the modern 

 developments very satisfactorily. 



It may be observed that while the treatment of the topics is 

 decidedly and extensively mathematical, the calculus has been 

 employed in only a few places where it seemed unavoidable, 

 and the author believes that the book should be intelligible to 

 students of moderate mathematical attainments. It is supplied 

 with numerous numerical problems which are undoubtedly 

 very serviceable in enabling students to attain a mastery of 

 the fundamental principles of the subject. h. l. w. 



4. The Formation of Colloids; by Th. Svedberg. 12mo, 

 pp. 127. New York, 1921 (D. Van Nostrand Company. 

 Price $2 net. Printed in Great Britain). — This is the first of a 

 proposed series of monographs on the physics and chemistry 

 of colloids by the same author. It presents a systematic survey 

 of the processes by which colloids are formed, with particular 

 attention to the conditions which determine the degree of 

 subdivision of the products. 



This book is very interesting in showing very clearly the 

 present aspects of this rapidly developing branch of chemistry, 

 and it is also valuable in giving an excellent list of references 

 to the literature of the subject. h. l. w. 



5. Physikalische Chemie der Zelle und der Gewebe, by 

 Rudolph Hober. I Halfte, 8vo, pp. 544. Leipzig, 1922 

 (Verlag von \Vilhelm Engelmann). — This is the fifth edition 

 of a very remarkable book. It is to be issued in two volumes 

 of which only the first has appeared. 



The titles of the six chapters of part I give an excellent idea 

 of the scope of the book. They are : Theory of solutions and 

 osmotic pressure ; electrolytic dissociation ; determination of 

 hydrogen ions and their physiological significance; surface 

 phenomena ; colloids ; and velocity of reaction and the 

 effect of ferments. In every chapter, there is an excellent 

 presentation of the physical chemistry of the subject including 

 theory and methods of work, followed by applications to biology. 

 The book should be of the greatest interest to biologists and 



