130 
considers the oxalate method. — Ztsclir. f. ang. Chem.. Berl., 1906, v. 
19, part 2, pp. 1708-1711. 
Jorgensen. Gunner, presents a new modification of the method for 
estimating phosphoric acid as magnesium ammonium phosphate. — 
Ztschr. f. anal. Chem.. TCiesb., 1906. v. 15, pp. 273-315. 
Schmitz. B., discusses the estimation of phosphoric acid as mag- 
nesium pyrophosphate ; outlines his method and reports experimental 
work. — I bid ., pp. 512-522. 
The Ph. Brit. Committee of Reference in Pharmacy points out 
that the U. S. P. volumetric test for concentrated phosphoric acid 
is simpler that the Ph. Brit, lead oxide test. — Chem. & Drug., Lond., 
1906, v. 69, p. 862. 
Cowley, R. C., criticises the lead oxide test, which he says has at 
least two defects : The lead oxide is assumed to be perfectly free from 
water, which it is not; and, especially with acids of high specific 
gravity, the chemical action between the acid and the lead oxide 
causes the evolution of so much heat as to vaporize a portion of the 
water produced before weighing is completed. — Pharm. J., Lond., 
1906, v. 23, p. 510. 
Joyce, T. G., presents the results of his analyses of samples from 
four different makers and asks if it be not possible to produce phos- 
phoric acid free from injurious substances, and. at the same time, 
free from those that are incompatible with others, which in pharma- 
ceutical preparations it may be necessary to use in conjunction. — 
Ibid., 115. 
Evans Sons, Lescher & IVebb report on the examination of one 
small bottle of phosphoric acid, labeled u Pure B. P..” which was 
heavily contaminated with iron and chlorides. — Analytical Xotes for 
1906, 1907, p. 27. 
Patch. E. L ., reports ‘that different lots of phosphoric acid con- 
tained phosphates and sulphuric acid. 
Gane, E. H., found an excess of silica cloudy with small gelatinous 
precipitate. — Proc. Am. Pharm. Ass., 1906, v. 51. p. 333. 
Graham, Willard, found, on diluting some samples of phosphoric 
acid with an equal volume of water, that a flocculent precipitate was 
produced. On examination this impurity proved to be silica. One 
sample was found to contain considerable iron and sulphates. — Proc. 
Pennsylvania Pharm. Ass., 1906, p. 153. 
Kebler, Lyman F., reports two samples of phosphoric acid, sup- 
posedly U. S. P. : one contained silicious matter and the other iron. — 
Proc. Am. Pharm Ass., 1906, v. 51. p, 318. 
Harvill, J. Paul, combines iodine and phosphoric acid in the 
treatment of the cough, night sweats, and gastric derangements of 
phthisis.- — Abstr. in Eclectic Med. J.. Cincim, 1906, v. 66. p. 282 v 
