Chemistry and Physics. 383 



3. Separation and Estimation of Beryllium. — Parsons and 

 Barnes have devised an analytical method for the heretofore 

 very troublesome separation of beryllium from iron and alumi- 

 num. The principle is simple and the execution of the process 

 has given excellent results in the hands of the authors. The sep- 

 aration is effected by the action of a 10 per cent solution of acid 

 sodium carbonate upon the hydroxides. The liquid is heated 

 rapidly and is just brought, to boiling for not over a minute. 

 Beryllium hydroxide dissolves, while the other hydroxides remain 

 undissolved. A double application of the operation appears to be 

 necessary with large quantities. In the filtrate, or united filtrates, 

 the beryllium may be precipitated, after acidifying and boiling 

 off the carbon dioxide, by means of ammonia. The washing of 

 the beryllium hydroxide with ammonium acetate is recommended, 

 as in the absence of an electrolyte it tends to pass through the 

 filter in a colloidal condition. — Jour. Am. Chein. Soc, xxviii, 1589. 



h. l. w. 



4. Atomic Weights of Manganese and Cobalt. — Baxter and 

 Hines have made an elaborate series of determinations of the 

 atomic weight of manganese by analyzing the chloride and bro- 

 mide, obtaining in both cases the number 54-9H. Hence no 

 change is recommended at present in the number 55*0 now ac- 

 cepted. Baxter and Coffin have made a new determination of 

 the atomic weight of cobalt by means of an extensive series of 

 analyses of the chloride and have obtained 58*997, which is the 

 same as the result of Richards and Baxter upon the bromide. 

 Both of the investigations here mentioned are good examples of 

 the refined work on atomic weights that are being carried on 

 under the leadership of Professor T. W. Richards. — Jour. Am. 

 Chem. Soc, xxviii, 1560 and 1580. h. l. w. 



5. Introduction to Metallurgical Chemistry / by J. H. Stansbie. 

 12mo, pp. 252. New York, 1907 (Longmans, Green & Co.). — 

 Although purported to be published in New York, this is an 

 English book. The author has prepared it for technical students 

 in connection with his work with night classes in the Birming- 

 ham Municipal Technical School. Its object is to give such stu- 

 dents the chemistry needed for the subsequent study of metal- 

 lurgy. While the book is admitted to be mainly practical in its 

 character, and to deal particularly with the metals, it treats the 

 subject much more broadly than might be expected, and shows 

 so much originality, and so many good experiments, that it is well 

 worth the attention of teachers of chemistry as a book that may 

 furnish many useful suggestions. h. l. w. 



6. A Text- Booh of Electro - Chemistry • by Max Le Blanc 

 Translated by W. R. Whitney and J. W. Brown. Svo, pp. 338. 

 New York, 1907 (The Macmillan Company). — This is a trans- 

 lation of the fourth German edition of a well known and valuable 

 work. The earlier translation of the first edition by one of the 

 collaborators in the present work has been mostly rewritten, and 

 extensive additions and changes have been made in it. For the 



