42 
Martin, Geoffrey, offers a contribution to the theory of solution in 
which he seeks to explain the nature of solution by considering the 
forces brought into play when a foreign molecule is introduced among 
the molecules of a solvent. — Abstr. in J. Am. Chem. Soc., X. Y., 1905, 
v. 27, p. 388 (from J. Phys. Chem.). 
Herz and Knoch, in a contribution on solubilities in mixtures of 
solvents, enumerate a number of substances and discuss their solubil- 
ity in mixtures of acetone and water, mixtures of alcohol and water, 
and in mixtures of alcohol and glycerin. — Ztschr. f. anorgan. Chem., 
1905, v. 45, pp. 262-269. 
Hulett, G. A., discusses solubility and size of particles. He con- 
cludes that the influence of size of particles seems to be of the same 
order of magnitude for different substances, and is therefore especially 
a source of error when very slightly soluble substances are used. — 
Abstr. in J. Am. Chem. Soc., X. Y., 1905, v. 27, p. 447. 
Philip, James Charles, discusses the influence of various sodium 
salts on the solubility of sparingly soluble acids. — J. Chem. Soc. 
Lond., 1905, v. 87, pp. 987-997. 
Foote. H. TY, discusses the solubility of potassium and barium 
nitrates and chlorides. — Abstr. in J. Am. Chem. Soc., X. Y., 1905, 
v. 27, p. 450. 
Foote and Bristol discuss the solubility of barium and mercuric 
chlorides. — Abstr., ibid., p. 450 (from Am. Chem. J.). 
9. BOILING POINT DETERMINATIONS. 
Riedel's Berichte includes a comprehensive review of a number of 
the boiling points that are given in the German Pharmacopoeia with 
some discussion of the methods that are involved or recommended for 
their determination. Some attempt was also made to determine the 
boiling points of the several materials under varying conditions of 
atmospheric pressure. The point is made that the pharmacopoeia 
should indicate whether or not a particular boiling point has been 
corrected and also state the barometric pressure for which it has been 
so corrected. It is further pointed out that the determination of the 
boiling point of a substance may be of value in connection with the 
determination of the purity of a substance, and it may be necessary 
to point out the direction in which variation from the official tem- 
perature may point to purity or impurity of a given substance. — 
Riedel’s Berichte, Berlin, 1905, pp. 37-53. 
10. MELTING POINT DETERMINATIONS. 
Hinrichs, Carl G., discusses the fusing points enumerated in the 
new U. S. P. and points out that “ the data of a pharmacopoeia should 
be such as to admit of easy confirmation and be of practical value.” — 
Am. J. Pharm., Phila., 1905, v. 77, p. 511. 
