80 Scientific Intelligence. 



These results are interesting inasmuch as they show a new and 

 convenient method of producing the compound corresponding to 

 the mineral realgar. It may be mentioned that a red modifi- 

 cation of As„S 3 is known, which is entirely distinct from the red 

 disulphide. — Berichte, xl, 3962. h. l. w. 



3. Titanium trichloride for Volumetric Analysis. — Knecht 

 and Hibbert recommend the use of a solution of TiCl 3 for vari- 

 ous volumetric operations where a powerful reducing agent is 

 required. Its use has given good results with organic nitro- 

 compounds, such as picric acid, and also with a number of dyes, 

 including indigo and azo-dyes. Another important application 

 of the reagent is in the determination of iron, where the authors, in 

 the place of the somewhat unsatisfactory dipping test formerly 

 employed, now add potassium thiocyanate in considerable excess 

 directly to the liquid to be titrated. The results of test analyses 

 made in this way show excellent results, and it may be mentioned 

 that where iron is partly or wholly in the ferrous condition it is 

 oxidized before titration by an exact addition of a permanganate 

 solution. The titanious chloride solution is drawn directly from 

 a reservoir into the burette, and the space above the liquid in the 

 reservoir is kept full of hydrogen by means of a small automatic 

 generator supplied with zinc and hydrochloric acid. — Berichte, 

 xl, 3819. h. l. w. 



4. Trait'e cle Chemie Analytique Qualitative ; par Duparo et 

 Monnier. Svo, pp. 374. Geneva, 1908 (Librairie Kilndig). — This 

 is the second edition, revised and enlarged, of a text-book on 

 qualitative analysis containing an unusually large amount of intro- 

 ductory and descriptive matter. The first 74 pages are devoted 

 to theoretical chemistry, including some of the more important 

 topics of modern physical chemistry. The next 40 pages are 

 devoted to the reagents, apparatus, and methods of qualitative 

 analysis. Then comes the descriptive part, occupying the greater 

 portion of the book, giving an account of the qualitative reac- 

 tions, and including a very full list of equations. A chapter in this 

 part gives the reactions of the more common organic acids, while 

 separate sections describe the reactions of the rare metals and the 

 alkaloids. The practical part of the book, comprising about 30 

 pages, gives an elaborate series of systematic tables for mineral 

 analysis, with references to the descriptive part. h. l. w. 



5. Kurzes Lehrhuch der organischen Chemie / von William 

 A. Notes. Svo, pp. 722. Leipzig, 1907 (Akademische Verlags- 

 gesellschaft). — The appearance of a German translation by Walter 

 Ostwald of this American text-book of organic chemistry is 

 worthy of mention. The book is introduced to the German- 

 reading public by a preface by the eminent Chemist, Wilhelm 

 Ostwald, who speaks in high terms of its independence and orig- 

 inality, and of its suitability as a guide for the student. He con- 

 siders that its translation was desirable, even in view of the 

 exceedingly abundant German litera ture of organic chemistry text- 

 books, h. L w. 



