366 , REVIEWS. 



Allen's Commercial Organic Analysis, Volnme II. Edited by Henry Leffmann 

 and W. A. Davis. 4th. ed. Cloth. Pp. x+520. Price, $5 net. Philadelphia : 

 P. Blakiston's Son & Co. 1909. 



The previous editions of this work have been so eminently serviceable 

 that analysts will naturally direct their attention to the fourth and latest 

 edition. Much of the subject-matter of the present volume appeared in 

 Volume II, Part I, of the third edition of "Commercial Organic 

 Analysis," but the analytical chemistry of explosives, which was partly 

 included in that volume, has been omitted. 



As is to be expected in a book of this kind, written by several contrib- 

 utors, different parts are of very different merit. In the opinion of the 

 reviewer the chapters on Special Characters and Methods, by Leonard 

 Archbutt, and Linseed Oil, by C. A. Klein, are particularly valuable. 

 The analyst will welcome the abundance of new material to be found in 

 Mr. Archbutt's chapter. The new data on tung, soja-bean, coconut, and 

 candlenut oils will be particularly welcome to analysts in the Orient. 

 The recent work by Mr. H. S. Walker of this laboratory on coconut oil 

 is included. 



The chapter on General Properties and Analytical Methods by C. 

 Ainsworth Mitchell does not appear to have been brought up to date as 

 thoroughly as the other chapters. The author fails to describe the Hanus 

 modification of the Wijs method for iodine absorption, although iodine 

 numbers obtained by this method are quoted in other chapters of the book. 

 Inasmuch as this method is widely used and is recommended by Leach, 

 Wiley, and other authorities, the reason for its omission is not clear. 



Altogether the book is a splendid compilation and an indispensable 

 asset for a well-equipped laboratory. 



B. T. B. 



