517 
Cocking, T. Tusting, presents a paper supplementary to that of 
C. A. Hill (Chem. & Drug., 1905, v. 66, pp. 388-391) on “Lead in 
pharmaceutical chemicals.” He gives a table (Chem. & Drug., Lond., 
1906, v. 69, p. 507) showing the contamination of zinc and its com- 
pounds with lead. 
Per cent. 
Zinc acetate 0. 001 to 0. 1 
Zinc carbonate .04 to . 14 
Zinc chloride .02 to . 04 
Zinc sulphate 1 . 0002 to . 02 
Zinc valerate .002 to .003 
Hill, C. A., adds a note as to the possibility of securing lead- free 
chemicals for the making of the necessary tests. — Ibid., v. 69, p. 553. 
Betrand and Javillier suggest a method, by the formation of cal- 
cium zincate, of precipitating quantitatively zinc from dilute solu- 
tions containing only 5 : 1,000,000 of the metal, and think that even 
then the limit of sensitiveness is not reached. — Bull, des sc. pharm- 
acol., Par., 1906, v. 13, pp. 650-653. 
ZINCI ACETAS. 
Caspari, Chas. E., reports 4 samples of zinc acetate examined — 3 
U. S. P. ; 1 contained chloride. — Proc. Missouri Pharm. Ass., 1906, 
p. 99. 
ZINCI CHLORIDUM. 
Wippern, Franz, points out that zinc chloride will dissolve clear 
in boiling distilled water and that dilutions may be made from a 
concentrated solution which will remain clear. — Pharm. Ztg., Berl., 
1906, v. 51, p. 807. 
Conrad, William, recommends the use of zinc chloride for the 
relief of pain or tenderness in the treatment of gingival recession 
and erosion cavities. — Dental Cosmos, Phila., 1906, v. 48, p. 560. 
Robinson, A. R., states that zinc chloride produces a dry necrosis, 
has no selective action on the pathological tissues in cancer, causes 
too little inflammation, and therefore should not be used in cancer 
except preliminary to some other caustic or the X ray. — X. York M. 
J., 1906, v. 84, p, 1260. 
Additional references to the use of zinc chloride will be found 
in the Index Medicus and the J. Am. M. Ass. 
ZINCI OXIDUM. 
Francis, John M., notes the several grades of zinc oxide obtainable, 
and says that while the chemical tests will render safe the use of a 
yellowish product, this is not wholly fitted for pharmaceutical uses; 
