55 
He also points out the widespread occurrence of small quantities 
of chloride as a contamination in chemicals sold for analytical pur- 
poses. The results are presented in the form of tables and indicate 
the presence of chlorides in objectionable amounts in many of the 
chemicals sold for analytical purposes. — Proc. Ass. Off. Agric. Chem., 
23d Ann. Conv., pp. 181-188. (Bull. Bur. Chem. U. S. Dept. Agric., 
1907, No. 105.) 
Eberle, E. G., asserts that with the average druggist a common 
source of error in the assay of drugs is his failure to verify the 
strength of his volumetric solutions, and points out that these solu- 
tions can not be trusted to maintain their “ titre “ if kept for any 
length of time under ordinary conditions. — Proc. Am. Pharm. Ass., 
1906, v. 54, p. 438. 
v. Friedrichs, Oscar, reports an examination of commercially avail- 
able volumetric solutions. He presents his results in the form of a 
table to illustrate the unreliable nature of these solutions. — Svensk. 
Farm. Tidskr., 1906, v. 10. 
Cowley, B. C., presents a method for the standardization of solu- 
tions of iodine and sodium thiosulphate which, he says, is novel only 
in the rapidity of execution. — Pharm. J., Bond., 1906, v. 23, p. 430. 
Acree and Brunei have prepared standard solutions of hydro- 
chloric acid and ammonium hydroxide sufficiently accurate to warrant 
them in believing that the principle of using weighted quantities of 
well-dried gases for making up standard solutions is one worthy of 
further study. — Am. Chem. J., 1906, v. 36, pp. 117-123. 
An abstract from Bep. de Pharm. outlines a method for using 
mercuric iodide for the demonstration of phosphorus, arsenic, or anti- 
mony hydride by passing the gas through a solution of mercuric 
iodide. Phosphorus gives an orange-yellow, arsenic a light-brown, 
and antimony a blackisli-brown precipitate. — Pharm. Zentralh., 1906, 
v. 47, p. 317.' 
Schlicht, A., suggests the use of phosphomoHbclic acid as a reagent 
for salts of potassium and asserts that it is superior to platinum 
chloride and tartaric acid. — Chem. Ztg., Cothen, 1906, v. 30, pp. 
1299-1300. 
Eeisert, in a German patent application, outlines a method of water 
purification in which barium carbonate is used as the precipitant. — 
Pharm. Zentralh., 1906, v. 47, pp. 137, 138. 
3. INDICATORS. 
Arny, H. V., thinks the pharmacopoeia shows too great a fondness 
for methyl orange, using it in several cases where phenolphthalein is 
usually used and to better advantage. * * * For the average 
observer the change from orange to pink is so gradual that it fre- 
quently means the addition of 1 c. c. of the volumetric solution to 
