51 
Merck, Bernhard, contributes two short papers discussing some of 
the reactions of iodides with persulphates, and outlining a method for 
demonstrating the presence of an iodide in a dry way. — Pharm. Ztg., 
Berlin, 1905, v. 50, p. 1022. 
Margosches, B. M., discusses the use of benzol as an indicator and 
reviews the literature to demonstrate that Schwezow was not the first 
to suggest the use of either benzol or toluol. — Zeitschr. f. Analyt. 
Chem., 1905, v. 44, pp. 392-395. 
Pouchet (Bullet, d. l’Acad. d, med., Paris) reports some historical 
investigation, personal experimentation, and clinical research bear- 
ing on the action of iodides on the circulation. — Abstr. J. Am. M. 
Ass., Chicago, 1906, v. 46, p. 390. 
NITRATES AND NITROGEN. 
Busch, E., has prepared synthetic diphenyl-endalino-dihydro-tria- 
zol (nitron), which he recommends as an excellent reagent for nitrates 
in aqueous solution. He asserts that it is sensitive to 1 : 80,000 of 
nitric acid. The substance can also be used as a quantitative test. — 
Pharm. Post, Wien, 1905, v. 38, p. 777. 
Bay, I. (Compt. rench, Paris, 1905, v. 140, pp. 796-797) , discusses the 
reaction of diphenylamine with nitric acid, and points out that what 
has been considered as being a characteristic reaction for nitric 
acid is also produced by oxidizing diphenylamine by other oxidizing 
agents. It is pointed out that in general all aromatic amines give 
rise to more or less highly colored oxidation products. — Abstr. J. Soc. 
Chem. Ind., Lond., 1905, v. 24, p. 458. 
Alvarez, E. P. (Chem. News, 1905, v. 91, p. 155), employs a 
sulphuric acid solution of diphenylamine with resorcinol or beta- 
napthol, as the colorations obtained are more persistent and are more 
easily distinguished from one another than when diphenylamine is 
used alone. He gives detailed directions for preparing the solutions 
and outlines the method of procedure. — Abstr. Analyst, Lonch, 1905, 
v. 30, p. 220. 
Hinrichs, G., is quoted as suggesting that the misinterpretation 
of the color reaction with diphenylamine may be obviated by apply- 
ing the diphenylamine test for other oxidizing agents first by means 
of a solution of the former in concentrated hydrochloric acid. — Abstr. 
Pharm. Ztg., Berlin, 1905, v. 50, p. 928. 
Andrews, Lancelot W., points out that the reaction for nitrates 
with phenolsulphuric acid mixture produces o-nitrophenol ^>-sulphonic 
acid, and not picric acid as assumed by Sprengel or clinitrophenol as 
suggested by Montenari. (Ztschr. f. angew. Chem., 1905.) — Abstr. 
Pharm. Zentralh., 1905, v. 46, p. 913. 
Lemaitre (Mon. scient., v. 18, p. 253) determined the amount of 
sodium perchlorate in commercial nitrates by fusing the nitrate 
