67 
tivelv few reagents are required, and the final determinations are 
made by means of the Marsh apparatus which can be operated under 
standard and uniform conditions. — J. Am. Chem. Soc., 1906, v. 28, 
pp. 178-185. 
Reckleben and Lockemann have investigated the reactions of arsenic 
hydride with silver nitrate solution, the halogens, the halogen acids, 
also with chromic and permanganic acids, and make a preliminary 
report. (From Ztschr. f. angew. Chem., 1906.) — Pliarm. Zentralh., 
1906, v. 47, p. 525. 
Reckleben and Lockemann (Ztschr. f. ang. Chem., 1906, v. 19, 
p. 275) recommend the hypochlorite, rather than the silver nitrate 
method for the determination of AsH 3 . — Biochem. Centralbl., Leipz., 
1906-7, v. 5, p. 175. 
Coblentz, Virgil, discusses the special tests for arsenic and the ob- 
jections to each. He summarizes these tests as follows: Berzelius- 
Marsh, limit, 0.001 mgm. As 2 0 3 ; Gutzeit silver, limit, 0.001 mgm. 
As 2 0 3 ; Gutzeit mercuric chloride, limit, 0.002 mgm. As 2 0 3 ; Betten- 
dorf. limit, 0.1 mgm. As 2 O s . — Am. J. Pharm., Pliila., 1906, v. 78, pp. 
305-311. 
5. BIOLOGIC PRODUCTS. 
TVeidermann, H. P., in an article on chemical engineering in the 
packing house, enumerates and reviews, in addition to pepsin, pan- 
creatin, thyroid, and suprarenal gland, the following animal extracts: 
Cardine from the heart of the bullock, medulline from the spinal 
cord, testine from the testes of the bull and ram, ovarine from the 
ovaries of the hog. musculine from the muscular tissue, and cerebrine 
from the brain of the bullock. — Chem. Eng., Pliila., 1906-7, v. 5, p. 73. 
Arnold, L., records a list of the drugs of animal origin employed 
by Arabs. This list embraces substances of human origin. — Bull, 
pharm. du Sud-Est., Montpel., 1906, v. 11, pp. 69-74. 126-129. 
Wintgen and Keller discuss the composition of lecithins. They 
conclude that for plant lecithin the phosphorus and the nitrogen con- 
tents are not always indicative, though they might be for the lecithin 
obtained from egg yolk. Lecithin, they believe, should be reserved 
as a name for the preparation made from egg yolk, while the plant 
extracts should be designated to indicate their origin. — Arch. d. 
Pharm., Berl., 1906, v. 244, pp. 3-11. 
ENZYMES. 
Poliak, Isidor. discusses diastatic enzymes and their practical appli- 
cation, both as to medicine and for technical purposes. — Chem. Ztg., 
Cothen, 1906, v. 30, pp. 219, 220. 
Smeliansky. Mana (Arch. f. Hygiene, 1906, v. 59, pp. 187-215), 
discusses the influences exerted, by various additions, on the coagula- 
