64 
Foerster, F., discusses the quantitative determination of metals in 
aqueous solution by means of electrolysis and the factors that influ- 
ence accurate determination. — Ztschr. f. ang. Chem. Berl., 1906, v. 
19, part 2, pp. 1842-1849. 
SULPHUR AND SULPHATES. 
Kleine, A., describes and discusses the use of an apparatus for 
the determination of sulphur.— Ztschr. f. ang. Chem. Berl., 1906, v. 19, 
part 2, p. 1711. 
Leffman, Henry, discusses the titrimetric determination of sul- 
phates by means of benzidin hydrochloride. (Oil, Paint and Drug 
RejD., 1906, v. 70, Dec. 3, p. 23.) — Proc. Pennsylvania Pharm. Ass., 
1906, p. 161. 
NITRATES. 
Leffman, Henry, discusses the use of nitron as a precipitant for 
nitric acid and nitrates and points out its advantages for determining 
the presence of nitrates in water bv a direct method. — Proc. Pennsvl- 
vania Pharm. Ass., 1906, p. 160. 
CARBON DIOXIDE. 
Lunge and Rittener discuss the determination of carbon dioxide 
either alone or in mixtures of gases absorbed by solutions of alkali. — 
Ztschr. f. ang. Chem. Berl., 1906, v. 19. part 2, pp. 1849-1854. 
Kleine, A., describes and discusses the use of an apparatus for the 
determination of carbon. — Ibid., v. 19, part 2, p. 1712. 
ACID, PICRIC. 
Feder, E., outlines a method for estimating picric acid by titrating 
with X/10 potassium hydroxide solution, using phenolphthalein as an 
indicator. — Ztschr. f. Centers, d. Xahr. u. Genussm., 1906, v. 12, p. 216. 
CITRATES AND TARTRATES. 
Tocher. J. F., discusses the reaction of tartaric and citric acid 
with cobalt nitrate solution and sodium hydrate. He records experi- 
ments with a number of organic acids and includes a table for the 
separation of tartrates, citrates, and malates. — Yearbook of Phar- 
macy, 1906, pp. 304-307. 
FEHLING’S SOLUTION. 
Lavalle, F. P., discusses the difficulties met with in the use of 
Fehling's solution and suggests the use of a solution containing an 
excess of alkali, to prevent the precipitation of red oxide of copper. — 
Chem. Ztg., 1906, v. 30, p. 17, - 
