50 
CHLORATES AND BROMATES. 
Scholtz, M., outlines a method for the titrimetric estimation of 
chlorates and bromates by reducing with nitric acid and nitrites and 
titrating with silver nitrate.— Arch. d. Pharm., Berlin, 1905, v. 243, 
p. 353. 
Jannasch and Jahn discuss the several methods that have been 
recommended for the reduction of bromates and chlorates, and record 
experiments with nitric acid, hydrogen peroxide, hydrazin sulphate, 
formic acid, and hydroxylamin sulphate. — Ber. d. deutsch. chem. 
Gesellsch., 1905, v. 38, pp. 1576-1589. 
COBALT. 
Kebler, Lyman F., reports finding cobalt nitrate contaminated with 
sodium chloride and calcium sulphate. — Proc. Am. Pharm. Ass., 
1905, v. 53, p. 183. 
fehling’s solution. 
Lavalle, F. P., obviates the possible difficulty of recognizing the 
end reactions with sugar and Fehling’s solution by proceeding as 
follows : 
Into a porcelain vessel holding about 200 cc. place 5 or 10 cc. of Fehling’s 
solution, 30 cc. of caustic soda solution (1:3), and 50 or 60 cc. of distilled 
water ; heat, and when the fluid begins to boil add gradually some of the 
solution of sugar, whose percentage is to be determined. The operation is 
finished as soon as the last drop causes the blue color of the Fehling’s solution 
to disappear. — Chem. News, Lond., 1905, v. 91, p. 299. 
Mrazsek, F. M., quotes Hehner (Chem. Centralbl., 1879, p. 406) in 
support of his statement that an excess of alkali should be avoided. — 
Ibid., 1905, v. 92, p. 20. 
Yan Dormail, J., enumerates several methods in which Fehling’s 
solution has been used, and discusses the element of error that has 
been demonstrated to exist in the weighing of the resulting oxide 
of copper. — Ann. de pharm. de Louvain, 1905, v. 11, pp. 281-289. 
HALOIDS. 
Wentzki, O., discusses the separation of iodine, chlorine, and 
bromine from one another in mixtures of chlorides, bromides, and 
iodides. — Zeitschr. f. angew. Chem., 1905, v. 18, pp. 696-698. 
Thilo, E. (Chem. Zeit., v. 27, p. 866), points out that when silver 
nitrate is added to a mixture of chlorides, bromides, and iodides, pre- 
cipitation occurs in three stages. He proposes to take advantage of 
this fact, and outlines a method of procedure for the determination 
of iodides in the presence of bromides and chlorides. — Abstr. Analyst, 
Lond., 1905, v. 30, p. 69. 
