115 
Freyszinge and Roche (Repert. de Pharm., 1905. p. 120) recom- 
mend the addition of from 0.03 to 0.05 gm. of calcium peroxide to 1 
liter of water. Allow to stand for two hours and filter through man- 
ganese dioxide to destroy the resulting hydrogen dioxide. This treat- 
ment they believe will serve to sterilize infected or suspected water. — 
Pharm. Zentralh., 1905, v. 46, p. 649. 
AQUA DESTILLATA. 
Ebert, K., points out that distilled water with a trace of copper in 
solution appears to have distinct advantages so far as keeping quali- 
ties are concerned. One sample observed by him was free from all 
evident contamination for a long period of time. While water con- 
taining copper may have the advantage of freedom from contami- 
nation, the author cautions against the use of such water in phar- 
macy. — Apoth. Ztg., Berlin, 1905, v. 20, p. 925. 
AQUA AMMONIJE. 
Francis, John M., points out that this substance is very frequently 
contaminated with pyridine, which may prove very objectionable 
when the ammonia water is dispensed with other substances or used 
in manufacturing operations. If dilute sulphuric acid be added to 
ammonia water to a point just short of neutrality, pyridine, if pres- 
ent, will readily be detected by its characteristic odor. * * * 
Pharmacists should note the legal possibilities involved in the specifications. 
“It (aqua annnonhe) must not be dispensed for medicinal purposes if it 
contains less than 10 per cent by weight of the gas.” Ammonia water loses 
its gas readily. Is your stock 10, 8, 6, or 2 per cent? — Bull. Pharm., Detroit, 
1905, v. 19, p. 361. 
Allen is reported as finding samples of ammonia water which did 
not comply with the requirements of the official standard. — Proc. 
Michigan Pharm. Ass., 1905, p. 80. 
Franklin, Edward Curtis, discusses the reactions that occur, or 
may occur, in liquid ammonia and contributes some further observa- 
tions on the use of ammonia as a solvent. — Ztschr. f. anorgan. Chem., 
1905, v. 46, pp. 1-35. 
Trillat and Turchet (Bui. Soc. Chim., 1905, v. 33, pp. 304-308) 
have devised a new method for determining ammonia, which is based 
upon the fact that when iodine is brought in contact with ammonia 
a black precipitate or coloration, due to the formation of nitrogen 
iodide, is produced. This resulting coloration can readily be com- 
pared with standard solutions as in the Xessler test. — Abstr. J. Soc. 
Chem. Ind., Bond., 1905, v. 24, p. 458. 
Bueler de Florin (Chem. Ztg., v. 28, p. 1264) recommends the use 
of yellow glass plates instead of solutions of known ammonia con- 
