Chemistry and Physics. 475 



1904. To the titrated solution mentioned above 10 cc. of 6 N 

 sulphuric acid is added for each 0.1 g. of total metal, and after 

 5 or 10 minutes the iron is titrated with the thiosulphate solu- 

 tion. No indicator except the free iodine is needed in either 

 titration. It was found that the method gave satisfactory results 

 except in cases where the amounts, either of copjjer or iron pres- 

 ent, were very small. — J. Chem. Soc, 121, 358. h. l. w. 



3. Introduction to Physical Chemistry ; by Sir James 

 "Walker. 8vo, pp. 440. London, 1922 (Macmillan and Co., 

 Limited). — This text book appears to have been very favorably 

 received and extensively used, for this is the ninth edition that 

 has appeared since its first publication in 1899, 



The book contains 36 chapters, each of which discusses an 

 important topic of physical chemistry very clearly and ably, with 

 particular attention to the practical applications of the theories. 

 The use of any but the most elementary mathematics has been 

 avoided, except in the last chapter which deals with the thermo- 

 dynamical proofs, where a rudimentary knoAvledge of the calcu- 

 lus is needed. The recent developments, such as those relating 

 to atomic number and isotopy, and also in regard to the structure 

 of atoms, including the theoretical work of the Americans G. N. 

 Lewis and Irving Langmuir, are well presented in this book. 



It may be mentioned that the author regards a recent ioniza- 

 tion theory by Ghosh as a satisfactory one having a theoretical 

 basis, whereas this theory is severely criticized by James Ken- 

 dall of Columbia University in the April, 1922, number of the 

 Journal of the American Chemical Society. Further discussion 

 of this matter is to be awaited with interest, and even if too much 

 credit has been given to this theory in the book, it is a very small 

 matter in connection with its general reliability and excellence. 



h. l. w. 



4. Colloid Chemistry of the Proteins; by Wolfgang Pauli. 

 Translated by P. C. L. Thorne. Part I. 8vo, pp. 140. Phila- 

 delphia, 1922 (P. Blakiston's Son & Co.).— This little book has 

 been developed from lectures delivered in Vienna a number of 

 years ago, and the English translation was made in England. It 

 deals with quantitative methods of physical and colloid chemis- 

 try as applied to proteins, a field in which the author and his 

 associates have made extensive and important investigations. 

 It is to be observed that the book does not deal with the ordinary 

 chemistry of the proteins, but considers the physical behavior of 

 a few of them in connection with their ionization, particularly 

 in the presence of acids and bases. The second part will include 

 the relations of the proteins to neutral salts and to the salts of the 

 heavy metals, to colloids and to ampholytes, the properties of the 

 albumin gels, and, finally, the physical chemistry of the purest 

 albumin so far prepared. H. l. w. 



