73 
Schiirhoff, P., reports on a number of adulterations of powdered 
drugs and their detection by means of the compound microscope. — 
Pharm. Ztg. Berl., 1906, v. 51, p. 479. 
Thomann, Julius, calls attention to a number of adulterations met 
with and points out the need of examining all powdered drugs by 
means of the microscope. — Schweiz. Wchnschr., f. Chem. u. Pharm., 
1906, v. 44, p. 544. 
Evans, John, comments on the frequency of adulteration and the 
necessity for and practicability of microscopic examination. He 
commends the method of Allen and the papers of Greenish and 
Collin. — Apothecary, Bost., 1906, v. 18, p. 906. 
Collin, E., points out the widespread use of rice chaff as an 
adulterant in powdered drugs and spices, and figures the character- 
istic structures. — Pharm. Ztg. Berl., 1906, v. 51, p. 680. 
Jones Henry William, has found it of distinct advantage to sup- 
plement the microscopic analysis of powdered drugs by a further ex- 
amination of the residues left after treatment with acid and alkali 
as generally used for the determination of fiber. He describes the 
process by which he concentrates a powder. — Pharm. J., Lond., 1906, 
v. 23, p. 102. (See also note on p. 161.) 
2. VALUATION OF VEGETABLE DRUGS. 
The Ph. Austr. VIII directs that the extract content of drugs be 
determined in a way outlined in the pharmacopoeia. — Ph. Austr. 
VIII, 1906, p. 27. 
Alcock. F. H., describes the process for the determination of the 
amount of nitrogen in some common drugs by the Ivjeldahl-Gunning 
process and summarizes his results with a number of drugs, grouped 
as seeds, leaves, barks, etc. — Pharm. J., Bond., 1906, v. 23, p. 100. 
See also Yearbook of Pharmacy, 1906, p. 286. 
Jones, Henry Williams, outlines methods for the separation of 
and the subsequent determination of the amount of fiber present in 
drugs by means of the microscope. — Yearbook of Pharmacy, 1906, 
pp. 290-291. 
The Gesc-hafts Bericht von Caesar & Loretz (1906, p. 5) gives the 
following figures : 
Pharmacopoeia. 
No. of 
vegetable 
drugs. 
No. of 
assays. 
No. of 
ash deter. 
Ph. Germ. IV. 1900 
127 
9 
12 
U. S. P. VIII, 1905 
151 
19 
13 
Ph. Ndl. IV. 1905 
136 
12 
41 
Ph. Belg. Ill, 1906 
134 
5 
22 
Ph. Austr. VIII, 1906 
171 
9 
147 
