41 
the formed nitrates. After allowing the crucible to cool, place it in 
an exsiccator for half an hour and weigh. — Geschafts Bericht v. 
Caesar & Loretz, i. Halle a. S., 1905, p. 83, ff. 
Gutzeit, E., recommends a method for the determination of ash 
in vegetable drugs. This involves the use of freshly calcined basic 
calcium phosphate, which is also described. — Abstr. in Proc. Am. 
Pharm. Ass., 1905, v. 53, pp. TOO and 714 (from Pharm. Ztg.). 
Wiithrich, E., recommends the addition of oxalic acid to aid com- 
bustion in ash determinations. — Abstr. in Pharm. Zentralh., 1905 ; v. 
46, p. 555 (from de Suikerindustrie). 
7. SPECIFIC GRAVITY. 
The editor, while commending the adoption of 25° C. for specific 
gravities and solubilities, adds: 
It is nevertheless to be regretted that the equivalent specific gravities and 
solubilities were not stated at 15° C. also, not only for comparison with a stand- 
ard which is now being used abroad, but in order to obviate the necessity, on the 
pharmacist's part, of purchasing instruments adapted for use at 25° C. or else 
making tedious compensatory calculations or comparisons with instruments 
graduated at 25° C.— Merck’s Rep., N. Y., 1905, v. 14, p. 284. 
Want, W. Philip, points out that the adoption of 25° C. as the tem- 
perature for determining specific gravity, though no doubt per se a 
convenience in America, has this drawback that the results obtained 
will not be directly comparable with European figures. — Am. Drug- 
gist, N. Y., 1905, v. 47, p. 96. 
Hinrichs, Carl G., asserts that “ the normality introduced will prove 
practical for the determination of the strength of weak solutions of 
acids and alkalies, not, however, for the higher strengths above 10 
per cent. — Am. J. Pharm., Phila., 1905, v. 77, p. 512. 
v. Wrochem, J., describes and outlines the method of using an 
apparatus designed to facilitate the determination of the specific 
gravity of substances in powder form. — Chem. Ztg. Cothen, 1905, 
v. 29, p. 1034. 
Ferguson, W. C., describes the methods employed in preparing the 
tables of specific gravity of sulphuric acid, nitric acid, hydrochloric 
acid, and ammonia that were adopted by the Manufacturing Chem- 
ists’ Association of the United States. — J. Soc. Chem. Ind., Lond., 
1905, v. 24, pp. 781-790. 
8. SOLUBILITIES. 
Hinrichs, Carl G., says : 
Solubilities are given now at 25° C. This makes a difference, as a rule, from 
the 1890 data of about 5 per cent, on the amount dissolved. — Am. J. Pharm., 
Phila., 1905, v. 77, p. 511. 
Kahlenberg, Louis, discusses the theories that have been advanced 
concerning the phenomena of solution. — Chem. Ztg. Cothen, 1905, 
v. 29, p. 1081". 
