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correct titration may be made if (1) the titration be made with great 
rapidity; (2) the volume titrated be small; and (3) the concentration 
of sulphuric acid be fairly great. — J. Chem. Soc., Bond., 1905, v. 87, 
pt. 2, pp. 1367-1370. 
Planes, Paul (from Journ. d. Pharm. et cl. Chim.), outlines a test 
for the colorimetric estimation of hydrogen dioxide which depends 
on the liberation of iodine from potassium iodide by free oxygen. — 
Abstr. Repert. de Pharm., Paris, v. 17, p. 102. 
Riesenfeld, E. H., discusses the decomposition of chromic acid by 
hydrogen peroxide.— Ber. cl. deutsch. chem. Gesellsch., 1905, v. 38, 
pp. 3578-3586. 
Friedheim, Carl, presents some critical studies on the use of hydro- 
gen peroxide in quantitative analysis, in the course of which he con- 
siders some of the criticisms that have been made by Jannasch on 
the use of hydrogen peroxide in the separation of manganese from 
zinc, manganese from copper, or chromium from aluminum. — Ztschr. 
f. analyt. Chem., 1905, v. 44, pp. 388-392. 
Baumann, E., reviews the literature relating to the preservation of 
milk by means of hydrogen peroxide and cites some of the objections 
that have been made to it; he records a number of experiments that 
were made to test the efficiency of the method, and concludes that 
every precaution should be taken to prevent contamination of the 
milk during milking, that milk should be treated immediately after 
milking before a multiplication of bacteria has taken place, and that 
a 30 per cent hydrogen peroxide solution can be used to avoid dilu- 
tion of milk. (Muench. Med. Wchnschr., 1905, pp. 1083-1088.) — 
Exp. Sta. Rec., v. 17, No. 1, p. 74. 
Eicholz (Milchw. Zentralbl., 1905, v. 1, pp. 500-501), criticises the 
work of Baumann noted above. — Ibicl., p. 1006. 
Vandevelde, A. J. J. (Beitr. chem. Physiol. u. Pathol., v. 5, pp. 
558-570), asserts that hydrogen peroxide increases the action of 
rennin, pepsin, trypsin, and the proteolytic ferments of milk. Varia- 
tions in the effect of the reagent on the different ferments are dis- 
cussed. — Ibid., v. 16, p. 539. 
Andresen, Vigo (Deutsch. Monatschr. f. Zahnheilkunde, Berlin, 
1905), discusses the use of hydrogen peroxide in the treatment of 
sensitive dentine. — Abstr. in Dental Cosmos, Phila., 1905, v. 47, p. 402. 
AQUA AURANTII FLQRUM. 
Francis, John M., points out that there is no means of determining 
the strength of orange flower water except “ by the nose." Naturally, 
quality will vary with the price, and the pharmacist must rely upon 
his sense of smell and upon the probity of the supplier. — Bull. Pharm., 
Detroit, 1905, v. 19, p. 361. 
