echinacea, baptisia, or sodium sulphocarbolate, all good remedies, but 
here clearly not indicated. When the whole field of medicine shall 
be covered by direct indications, as were here presented by sulphurous 
acid, then will the practice of medicine be greatly simplified. — Abstr. 
in Eclectic Med. J., Cinein., 1906, v. 66, p. 94. 
ACIDUM TANNICUM. 
Dekker, J., discusses the constitution of tannin and proposes the 
empiric formula C 14 H 10 O 9 (Ber. d. D. Chem. Ges., 1906, v. 39, p. 
2597). — Biocliem. Centralbl., Leipz., 1906-7, v. 5, p. 651. 
The Ph. Brit. Committee of Reference in Pharmacy points out that 
water of crystallization in tannic acid is doubtful. — Chem. & Drug., 
Loud., 1906, v. 69, p. 862. 
Thoms, H., presents a discussion of the nature and composition of 
tannins with extensive reference to the literature of the subject and 
a report of experiments made to determine the characteristics of the 
several tannins that are available. — Arb. a. d. pharm. Inst. d. Univ., 
Berl., 1906, pp. 61-82. 
Gliicksmann, C., discusses the valuation of tannin and controverts 
the criticisms made by Thoms. — Pharm. Prax., 1906, v. 5, pp. 33-49, 
86-95. 
Franke, H., discusses the production of pure tannin, reviews the 
work done by Thoms on commercial tannins, and records the several 
methods used in the production of this material. — Pharm. Zentralhl., 
1906, v. 17, pp. 795-798. 
Vaubel and Scheuer discuss the determination of tannic acid and of 
tannin-containing materials. — Ztsclir. f ang. Chem., Berl., 1906, v. 
19, pt. 2, pp. 2130-2133. 
Franke, H., discusses the chemistry of several of the newer, medic- 
inally important, combinations containing tannin.— Pharm. Zentralhl., 
1906, v. 47, pp. 534-538. 
Rosenthaler, L., criticises the statement made by Franke and quotes 
other authors. — Ibid., v. 47, p. 604. 
Franke, H., discusses the direct estimation of tannic acid, reviews 
some of the methods previously used, and reports experiments with 
the use of formaldehyde as a precipitant. — Ibid., v. 47, pp. 599-604. 
He proposes the use of sodium chloride to aid in the precipitation 
of tannin in the analysis of this substance. — Ibid., v. 47, pp. 887-889. 
He also discusses the nature and composition of tannin and reviews 
the literature relating to the chemical examination of this substance. — 
Ibid., v. 47, pp. 983-987. (See also p. 1052.) 
Fernan, Albert, discusses the several methods for the valuation of 
tannins and asserts that there is no one method that will give gener- 
ally acceptable results in all cases. — Pharm. Post, Wien, 1906, v. 39, 
pp. 37-39. 
