97 
ACIDUM SULPHURICUM. 
Herting, Otto, discusses the nomenclature and tests for purity as 
compared with those included in the Ph. Germ., IY, and Ph. Brit., 
IY. — Deut.-Amer. Apoth. Ztg., N. Y., 1905, v. 26, p. 127. 
Lyons, A. B., points out that in the quantitative test, U. S. P., 
VIII, page 23— 
It would be better to take 1 cc. of the acid for the titration rather than three. 
The latter would call for more than 100 cc. of the volumetric alkali. In general 
it may be remarked that the quantity of material prescribed for a titration 
should be such that between 20 and 30 cc. of the volumetric solution would be 
required. A smaller quantity necessitates very close readings of the burette. — 
Proc. Am. Pharm. Ass., 1905, v. 58, p. 259. 
Kebler, Lyman F., reports finding sulphuric acid containing lead 
and iron. — Ibid., p. 182. 
Burke, W. J., examined 25 samples of dilute sulphuric acid ; 2 were 
practically of U. S. P. strength, 6 below, and 17 above ; ranging from 
7.05 to 19.4 per cent. — Proc. Massachusetts Pharm. Ass., 1905, p. 105. 
Raschig, F. (Zeit. f. angew. Chem.), discusses the estimation of 
sulphuric acid. — Reprinted in Scientific Am. Suppl., 1905, v. 59, 
p. 24603. 
Hart, Edward, in a review of some present problems in industrial 
chemistry, points out that sulphuric acid is now being made in 
quantity from the gases obtained in the roasting of zinc blende. 
Another source is in the roasting of pyrrhotite, of which vast deposits 
exist, among other places, in southwest Virginia. — J. Am. Chem. Soc., 
N. Y., 1905, v. 27, p. 158. 
Luety, F., in a paper reprinted from the Zeitschr. f. angew. Chem., 
discusses the manufacture of sulphuric acid and describes some of 
the modern improvements in the sulphuric acid chamber process. — 
Chem. Eng., 1905-06, v. 3, pp. 25-32. 
Raschig, F., discusses the several theories advanced as to the oxida- 
tion of nitrous oxide in the manufacture of sulphuric acid by the lead 
chamber process. — Ztschr. f. angew. Chem. 1905, v. 18, pp. 1281-1323. 
Ferguson, W. C., publishes a sulphuric acid table which includes 
specific gravity determinations for sulphuric acid varying from 0.713 
to 93.226 per cent. — J. Soc. Chem. Ind. Lond., 1905, v. 24, p. 787. 
North and Blakey discuss the preparation of standard solutions of 
sulphuric acid. They review the several methods suggested in the 
last twelve years, and describe their method of preparing pure sodium 
bicarbonate, with tables of factors of acids obtained and of compari- 
sons of bicarbonate as sold with pure bicarbonate. — Ibid., pp. 395 _ 
397. 
Scholtz, M., outlines a method for the titrimetric estimation of 
combined sulphuric acid. To a hot solution of the sulphate he adds 
77489— Bull. 49—09 7 
