202 
CALCII PHOSPHAS PR^ECIPITATUS. 
The Ph. Brit. Committee of Reference in Pharmacy report on cal- 
cium phosphate says : Description obscure, and allows the use of both 
Ca 2 2(P0 4 ) and CaHP0 4 . — Chem. & Drug., Lonch, 1906, v. 69, p. 863. 
Wiebelitz, H., asserts that the Ph. Germ, requirement that calcium 
phosphate be almost insoluble in acetic acid should be eliminated. — 
Pharm. Ztg. Berl., 1906, v. 51, p. 1003. 
Evans Sons Lescher and Webb found several impurities in calcium 
phosphate. The most important were ultramarine, sodium carbonate, 
and copper. — Analytical Notes, for 1906, 1907, p. 11. 
Patch, E. L., examined four lots of precipitated calcium phosphate 
contaminated with iron and excess of chloride. — Proc. Am. Pharm. 
Ass., 1906, v. 54, p. 335. 
Caspari, Chas. E., reports five samples examined: All contained 
chloride, arsenic, metallic impurities, and were not completely solu- 
ble in dilute acids. — Proc. Missouri Pharm. Ass., 1906, p. 101. 
CALCII SULPHAS EXSICCATUS. 
Cowley, R. C., describes a method for the determination of calcium 
sulphate in plaster of Paris, and adds that the same method may be 
used for the determination of Ca in precipitated and prepared chalk, 
lime, and slaked lime, calx chlorinata, liquor calcis chlorinata, and 
grey powder. — Pharm. J. Lond., 1906, v. 23, p. 429. 
Arth and Cretien discuss the solubility of calcium sulphate in 
solution of sodium chloride. — Bull. Soc. cle chim. Par., 1906, v. 35, 
pp. 778-781. 
Bartlett, C. O. (Chemical Engineer), outlines the process employed 
in the manufacture of commercial plaster of Paris. — Oil, Paint, and 
Drug Rep., 1906, v. 70, Aug. 20, p. 39. 
CALUMBA. 
The Ph. Brit. Committee of Reference in Pharmacy points out 
that for caliunba root, microscopic characters and ash percentage 
should be given. — Chem. & Drug. Lond., 1906, v. 69, p. 863. 
Tunmann discusses the occurrence of calcium oxalate crystals in 
caliunba and points out that the frequently made assertion that cal- 
cium oxalate crystals occur only in the stone cells of the bark is er- 
roneous, and that they are distributed throughout the woody portion 
of the root as well as in the bark. He outlines a method for readily 
demonstrating their presence. — Pharm. Zentralh., 1906, v. 47, p. 1069. 
Glinzel. E., discusses some of the work done on the chemistry of the 
root of J ateorhiza pcdmata , the production of the caliunba alkaloids, 
the iodide of calumbamine, the gold salt and the platinum salt of 
