"Weigel. G.. points out that the nitric acid test in the T7. S. P. VIII 
limits the official varieties of aloes to such as contain isobarbaloin. 
while the Ph. Germ. IV restricts the use of aloes to African varie- 
ties giving a green coloration with nitric acid. — Pharm. Zentralh.. 
1906. v. 17. p. 43. 
G. Hell & Co., in Troppau. assert that the water content of aloes 
that complies with the requirements of the Ph. Germ. IV will vary 
from 8.26 to 9.10 per cent, and the ash content of the water free drug 
varies from 1.05 to 1.S7 per cent. — Pharm. Post. Wien. 1906. v. 39. 
p. 150. 
Lackey. E. H., quotes a correspondent who asserts that it is quite 
common to supply Curacao aloes, especially the powdered, when 
Barbacloes aloes is ordered. — Proc. Pennsylvania Pharm. Ass.. 1900. 
p. 115. 
Eberle. E. G.. suggests that the aloin content of aloes be stated.- — 
Proc. Am. Pharm. Ass.. 1906. v. 54. p. 450. 
Eldred and Jennings outline a method for the estimation of aloin 
in aloes and record some experiments with several modifications. — 
Proc. Am. Pharm. Ass.. 1906. v. 54. pp. 423-425. 
Hankey. William T.. points out that the U. S. P. VIII test for 
solubility in alcohol is rather indefinite. He believes that a satisfac- 
tory method of valuation based on the aloin content would be of great 
value. — Am. Druggist. X. Y.. 1906. v. 49. p. 360. 
Naylor. W. A. H.. summarizes our knowledge of aloes and sug- 
gests that the most rational method of assaving the drug would be 
to estimate the nonresinous constituents either directly or by differ- 
ence. He notes that the accuracy of the Tschirch-Hoffbauer process 
has been disproved by van Itallie and adds that a series of experi- 
ments with the object of determining the proportion of nonresinous 
constituents and aloin would be of service in helping to fix standards 
for this important drug. — Pharm. J.. LoncL. 1906. v. 23. p. 73. 
Holmes. E. VI. . points out that the opaque variety of aloes formerly 
known as Natal aloes has disappeared entirely from the market; 
that the aloes that is now made in Natal corresponds with the vari- 
ety known as Cape aloes, and that there is some uncertainty as to 
where the so-called Natal aloes was made. It was exported from 
Port Natal, and J. Medley Wood, the curator of the Botanic Gardens 
at Durban. Natal, has come to the conclusion that it was prepared 
either in the Transvaal or Ehodesia. — Ibid., v. 22. p. 314. 
Leger has extracted from Natal aloe, among other products, the 
metliylnataloemodine. which is changed by fuming HC1 130° into 
trioxymethylanthraquinone. the nataloemodine. — J. de pharm. et de 
chirn. Par.. 1906. v. 23. pp. 134-135. 
Seel. Eugen. discusses the oxidation products of aloes constitu- 
ents. — Pharm. Zentralh.. 1906. v. 47. pp. 850-852. 
