98 
an excess of 1/10 X. barium chloride, and titrates this with a solution 
of potassium chromate. The excess of the chromate is subsequently 
determined by titration with sodium thiosulphate. — Arch. d. Phar., 
1905, v. 243, p. 667. 
Lunge and Stierlen discuss the estimation of sulphuric acid in the 
presence of disturbing substances. They point out the limitations 
of the reaction between sulphuric acid and sulphates with barium - 
chloride : also some of the possible sources of error. — Ztschr. f . angew. 
Chem., v. 18, 1905, pp. 1921-1930. 
Blacher and Koerber outline a simple method for the titrimetric 
estimation of the combined alkali sulphates by means of barium chlo- 
ride with phenolphthalein and sodium carbonate as indicators. — 
Chem. Ztg., Cothen, 1905, v. 29, p. 722. 
Linde (Apoth. Ztg., 1905, pp. 46-47) has examined a number of 
drugs and finds that the color test for curcuma with sulphuric acid 
is fallacious. He records his experiments and enumerates a number 
of drugs that give a reaction similar to that given by curcuma. — 
Abstr. Pharm. Zentralh., 1905, y. 46, p. 746. 
Cook, George W., discusses the use of sulphuric acid in the removal 
of pulps with calcific formations. — Dental Cosmos, Phila., 1905, 
v. 47, p. 631. 
Ivuhl and Hahn (Apoth. Ztg., 1905, v. 20, p. 867) discuss the com- 
position of mistura sulphurica acida of the Ph. Germ., IY, and point 
out that both this and the preparation of a similar character of the 
Ph. Brit., IY, which is not so strong, undergo changes. He describes 
the methods recently devised for the examination of the German 
preparation and points out that up to a certain undetermined point 
there is production of ethyl hydrogen sulphate with a corresponding 
reduction in acidity. — Abstr. in Pharm. J., Lond., 1905, v. 21, p. 723. 
ACIDTJM SULPHTJROSTJM. 
Allen reports that he found samples of sulphurous acid which 
did not comply with the requirements of the official standard. — Proc. 
Michigan Pharm. Ass., 1905, p. 80. 
Puff and Jeroch discuss the quantitative estimation of sulphurous 
acid in alkaline solutions, by titrating with iodine solution in an 
atmosphere of carbon dioxide in the presence of mannitol. — Ber. d. 
deut. chem. Gesellsch., 1905, v. 38, pp. 409-419. 
Blarez and Gautrelet report a study of the toxic action of sul- 
phurous acid when injected subcutaneously. — Bull. Soc. Pharm., 
Bordeaux, 1905, v. 45, pp. 169-177. 
ACIDTJM STEARICUM. 
Francis. John M.. points out that much of the commercial stearic 
acid has a melting point below 56° C. and should be refused, as a 
