Chemistry and Physics. 559 



deals with the important methods for the determination of molec- 

 ular weights. The second chapter discusses rather extensively 

 ultimate organic analysis, including nitrogen, sulphur, the halo- 

 gens, phosphorus and arsenic. Chapter III explains very fully 

 the methods for the estimation of typical groups, including the 

 carboxyl, amido, acetyl, hydroxyl, amino and imino, nitro, and 

 <5arbonyl groups. The fourth chapter, which is the last and com- 

 prises about 140 pages, takes up the estimation of some com- 

 pounds of technical importance, such as sugars, indigo, fats, oils 

 and waxes, a few alkaloids, alcohols, etc. Some of the descrip- 

 tions in this last chapter are brief, but here, as well as in the other 

 sections of the book there are copious references to the original 

 literature. h. l. w. 



4. Essays and Addresses ; by James Campbell Brown. 8vo, 

 pp. 208, London, 1914 (J. & A. Churchill. Price $2 net). — 

 The late Dr. Brown, who was Professor of Chemistry in the Uni- 

 versity of Liverpool, had prepared and read a large number of 

 papers, of which this book gives a selection of a dozen. While 

 they were written from 10 to 28 years ago, they are in most cases 

 of permanent interest. One of the addresses is a translation of 

 Liebig's fascinating short autobiography, another gives very inter- 

 esting reminiscences of Hofmann, another celebrated German 

 chemist, who went to England in 1845 and taught and carried on 

 investigations there for a period of twenty years. Several of the 

 addresses give advice to students, particularly in regard to educa- 

 tion in technical chemistry. h. l. w. 



5. Metallurgy ; by Henry Wysor. 8vo, pp. 391, Easton, Pa., 

 1914 (The Chemical Publishing Co.). — This book is described on 

 the title-page as "A condensed treatise for the use of College 

 students and any desiring a general knowledge of the subject." 

 This is the second edition, about 80 pages larger than the first, 

 which appeared six years ago. The preface states that the criti- 

 cisms of the first edition have been carefully weighed, but it 

 appears that there is still room for much criticism in regard to the 

 present edition. It contains many unsatisfactory and even incor- 

 rect statements, and many very important facts are not mentioned. 

 However there are many things that are well discussed in the 

 book, and the illustrations are usually very satisfactory, h. l. w. 



6. Introduction to Organic Chemistry ; by John Tappan 

 Stoddard. 12mo, pp. 418, Philadelphia, 1914 (P. Blakiston's 

 Son & Co.). — This book is intended to be used in connection 

 with lectures, recitations, and laboratory work in the first course 

 of organic chemistry in college. Although it is considerably 

 smaller than most texts of similar character, it seems to be well 

 suited for the purpose in view, as it contains most of the essen- 

 tial facts needed by beginners and presents the subject clearly. 

 It appears, however, that brevity has been carried too far in some 

 instances. For example, the chapter partially devoted to dyes 

 comprises scarcely three pages, while uric acid and the related 

 compounds are given but a single page. Also the matter of 



