116 
tent for a color scale in working with Xessler's reagent. — J. Am. 
Chem. Soc., 1905, v. 27, p. 1318. 
Perman, E. P., records the results of attempts to synthetize am- 
monia with a view of determining whether there is a state of 
equilibrium between ammonia and its constituent elements at various 
temperatures. The author concludes that ammonia can not be syn- 
thetized by heat except under certain special conditions. — Exp. Sta. 
Pec., v. 17. p. 525. 
Ferguson. TV. C., gives a table of specific gravities for ammonia 
water varying from 5.07 to 33.10 per cent of XH S . — J. Soc. Chem. 
Ind., LoncL, 1905, v. 21. p. 786. 
AQUA HYDRO GENII DIOXIDI. , 
Patch. Edgar L. (Am. Druggist. 1905, p. 321). reports finding 
hydrogen dioxide solution containing 0.560 sodium arsenate per liter. 
Wetterstroem. T., is reported as having examined four samples 
which assayed, respectively. 2.26, 3.25, 3.15, and 3.11 per cent : acidity 
0.1 cc., 0.37 cc., 0.33 cc., and 0.33 cc., volume KOH. — Proc. Am. 
Pharm. Ass., 1905, v. 53, p. 181. 
The committee on adulteration reports that six samples were found 
to contain, respectively, 2.61, 2.96, 2.91, 1.11, 3.15. and 3.00 per cent 
of H 2 0 2 . — Proc. Michigan Pharm. Ass., 1905, p. 78. 
TVetterstroem, Theo. D., in discussing the preservation of hydro- 
gen dioxide points out that one-twentieth of 1 per cent of sulphuric . 
acid is used to hold in check the hydrofluoric acid that trails into 
the preparation from the fluor spar, a contamination of the barium 
dioxide. — Drug. Circ. & Chem. Gaz., X. Y., 1905, v. 19, p. 311. 
Rumpel. H., in discussing the testing of medicinal hydrogen diox- 
ide, expresses the belief that the apothecary is not sufficiently careful 
in testing his supplies of hydrogen dioxide. His results show that 
commercial samples require from 0.2 cc. to more than 2.0 cc. of nor- 
mal potassium hydrate solution to neutralize the free acid contained 
therein. He believes that the test for free acid is much more valuable 
and more suggestive than the estimation of the contained H 2 0 2 
itself. — Apoth. Ztg., Berlin. 1905, v. 20, p. 981. 
Grimbert. L. (Journ. Pharm. Chim.. 1905, v. 21), asserts that 
arsenic is frequently present in solutions of hydrogen peroxide. 
One sample recently examined gave a red precipitate on the addition 
of silver nitrate. — Analyst. London. 1905. v. 30. p. 208. 
Schmatolla. Otto, in discussing the general subject of hydrogen 
dioxide, reviews the tests and the reactions for this compound.— 
Pharm. Ztg.. Berlin. 1905, v. 50, p. 610. 
Friend. John Albert, in discussing the estimation of hydrogen 
peroxide in the presence of potassium permanganate, points out that 
