SO Scientific Intelligence. 



boiler water, boiler scales, etc. ; analysis of engineering alloys ; 

 mi orographic analysis of steel ; pyrometry ; miscellaneous notes ; 

 bibliography of steel-works' analysis. The authors give full 

 descriptions of the analytical methods which they prefer, and also 

 give summaries of other important methods. The bibliography 

 is elaborate and will be useful, although it refers chiefly to 

 British journals. The book is supplied with many illustrations. 



h. l. w. 



6. Electro-chemical Analysis • by Edgar F. Smith. Third 

 edition, revised and enlarged. 8vo, pp. 204. Philadelphia, 1902 

 (P. Blakiston's Son & Co.). — The appearance of an improved 

 edition of Professor Smith's well-known, excellent book is to be 

 heartily welcomed. The work has been much enlarged, and the 

 section devoted to separations has been entirely recast, h. l. w. 



7. The Potash Salts' ; by Dr. L. A. Groth. 8vo, pp. 291. 

 London, 1902 (The Lombard Press). — This book gives an interest- 

 ing and instructive account of the great German potash industry, 

 including the history of its development, the geology and min- 

 eralogy of the deposits and many statistics. It also treats of the 

 applications of potash in industry, agriculture and horticulture. 

 Descriptions of various kinds of mining machinery are also given. 



h. l. w. 



8. Elektro-Metallurgie ; von Dr. W. Brochers, Dritte Auflage, 

 Erste Abtheilung. 8vo, pp. 288. Leipsic, 1902 (S. Hirzel). — 

 This is the first part of the third edition, much enlarged and 

 thoroughly revised, of a very important work on elektro-metal- 

 lurgy. The rapid development of this branch of industry makes 

 its description increasingly difficult, but it is evident that the 

 author has accomplished this well. The part under consideration 

 treats of the alkali, alkali-earth, and earth metals, also of copper 

 and partly of nickel. h. l. w. 



9. Physikalische Chemie der Zelle und der Gewebe / by Dr. 

 Rudolf Hober. 8vo, pp. 344. Leipzig, 1902 (Engelmann). — 

 The theories of osmotic pressure, electrolytic dissociation and 

 mass action are presented in about the usual manner but with 

 constant application to life processes. The work of Loeb on the 

 effects of ions and their electric charges receives favorable notice. 

 The methods used in physico-chemical research are given at some 

 length. Ferments, both organic and inorganic, are discussed, 

 Bredig's work in particular on this subject being reviewed. A 

 short chapter is devoted to the influence of temperature and pres- 

 sure on equilibria. 



The book should be of service to those who are interested in 

 physiological chemistry, where it is not improbable that much 

 progress will be made in the future by applying the theories of 

 physical chemistry. h. w. f. 



10. Electrical Properties of Thin Metal Films. — Professor J. 

 Patterson obtained metallic films by cathode discharges in 

 vacuo on glass strips. The thickness of the metallic deposit was 

 measured by Wiener's interference method (Wied. Ann. xxxi, 



