74 Scientific Intelligence. 



150 exercises are required for covering satisfactorily the whole 

 course as presented, but a provision is made for employing the 

 book for a shorter course by the omission of certain designated 

 articles and problems that are less important or more difficult 

 than the others. h. l. w. 



3. The Determination of Sulphur in Iron and Steel; by H. B. 

 Pulsifer. 8vo, pp. 160. Easton, Pa., 1922 (The Chemical 

 Publishing Company). — The determination discussed in this 

 book is an exceedingly important one, since sulphur has a delete- 

 rious effect upon the metals even in small amounts, and small 

 variations in the amounts present may have important effects 

 upon quality. As the total amount of sulphur present, except 

 in certain crude pig-irons, is usually less than 0.100%, and often 

 below 0.010%, the analytical problem is a delicate and difficult 

 one. A vast amount of research has been devoted to methods 

 of making this determination, and an excellent feature of the 

 book under consideration is an extensive and evidently very com- 

 plete bibliography of the subject, with many interesting com- 

 ments and citations of results. The bibliography covers prac- 

 tically the whole period of modern chemistry, as it begins with 

 the year 1797. It takes up about two-thirds of the book, and it 

 is not only interesting historically, but it should be of great value 

 to future workers on this problem. 



The author has made and records here a very large number of 

 sulphur determinations by several methods, and he recommends 

 the use of an "evolution" method, where the sulphur is first 

 converted into hydrogen sulphide by the action of concentrated 

 hydrochloric acid upon the metal in an apparatus of his own 

 modification, then the hydrogen sulphide is absorbed in an 

 ammoniacal solution of cadmium chloride, and after acidifying 

 the latter the sulphur is determined by titration with iodine solu- 

 tion. It does not appear to the reviewer that the author has 

 definitely shown that his preferred method is the most reliable 

 one, and it must be admitted that his results by different methods 

 show unexpectedly wide variations. h. l, w. 



4. Organic Chemistry; by Victor von Richter. Vol. II. 

 Chemistry of the Carooeyclic Compounds. Translated from the 

 11th German edition by E. E. Fournier D'Albe. 8vo, pp. 760. 

 Philadelphia, 1922 (P. Blakiston's Son & Co.).— This transla- 

 tion appears ten years later than the corresponding German 

 edition, but it is to be heartily welcomed as a work of much 

 importance to English-reading students of organic chemistry. 

 For many years the various editions of Richter 's Organic Chem- 

 istry have been very valuable sources of study and reference to 

 advanced students in the subject, as they have given excellent 

 presentations of the theories, as well as descriptions of very large 

 numbers of compounds. Our older chemists will remember that 



