90 
Herring, Otto, discusses the production of camphoric acid and its 
structural formula. — Deut.-Amer. Apoth. Ztg.. X. Y., 1905, v. 26, 
p. 99. 
ACIDUM CITRICUM. 
Herting, Otto, discusses the composition of citric acid, its pro- 
duction at the present time, and the possibility of its production by 
biologic processes. — Deut.-Amer. Apoth. Ztg., 1905, v. 26, p. 100. 
Heingartner, A. (Consular Rpts., U. S.. 1905), describes a method 
of extracting citric acid from lemon waste direct, which is reported 
to have been discovered by Giovanni Restuccia. of Italy.— Exp. Sta. 
Rec., v. 17, Xo. 4, p. 401. 
Ivebler. Lyman F., reports finding citric acid containing lead. 
Patch found one lot containing lead and iron, while ten lots, con- 
taining traces of iron and of sulphur, averaged 99.5 per cent pure. — 
Proc. Am. Pharm. Ass., 1905, v. 53, p. 182. 
In an unsigned article it is pointed out that citric acid lias been 
found to contain heavy metals and sulphates, probably due to sophis- 
tication of the technical product. — Suedd. Apoth. Ztg., 1905, v. 45, 
p. 758. 
Williams, John K.. suggests a formula for syrup of citric acid in 
which he proposes the use of extract of lemon (from the oil and from 
the fresh peel) instead of the tincture, with the addition of glyc- 
erin. — Proc. Connecticut Pharm. Ass., 1905, p. 49. 
ACIDUM GALLICUM. 
Herting. Otto, discusses some of the reactions of gallic acid and 
of tannin, their relations, and their several uses. — Deut.-Amer. Apoth. 
Ztg., 1905, v. 26, p. 100. 
ACIDUM HYDROBROMICUM DILUTUM. 
Herting. Otto, discusses the production of hydrobromic acid, the 
impurities found in it, and suggests a method for preparing hydro- 
bromic acid from bromine and methyl alcohol. — Deut.-Amer. Apoth. 
Ztg., 1905, v. 26, p. 141. 
ACIDUM HYDROCHLORICUM. 
Herting, Otto, discusses the composition of hydrochloric acid, its 
manufacture, and the production of a chemically pure article. — 
Deut.-Amer. Apoth. Ztg., 1905, v. 26, p. 128. 
Staedel. TY (Chem. Ind., 1905, v. 28, pp. 173-178, 198-204, 226- 
232), presents a study of the Hargreaves process for the manufacture 
of hydrochloric acid and records ja number of laboratory experiments 
designed to elucidate the nature of the reactions occurring in this 
process. — Abstr. J. Soc, Chem. Ind.. Lond., 1905. v. 24, pp. 439-140. 
