158 
MISCELLANY. 
from five to six rupees the seer. A still finer kind, the momeea or waxen 
churrus, is collected by the hand in Nipal, and sells for nearly double 
the price of the ordinary kind. In Nipal, Dr. M'Kinnon informs us, 
the leathern attire is dispensed with, and the resin is gathered on the 
skins of naked coolies. In Persia, it is stated by Mirza Abdul Russac, 
that the churrus is prepared by pressing the resinous plant on coarse 
cloths, and then scraping it from these and melting it in a pot with a 
little warm water. He considers the churrus of Herat as the best and 
most powerful of all the varieties of the drug. 
Ibid, from C Skaughnessy^s Bengal Dispensatory. 
Citrate, or Ammonio-Citrate of Iron. By Mr. A. J. Cooley. — Com* 
petition in the sale of this article has induced the manufacturer to adopt 
a cheaper formula than that originally published by Beral, and employed 
by many houses. It is now frequently prepared by placing together, 
for some days, in a warm situation, a mixture of iron filings, and citric 
acid in powder, with barely sufficient water to cover them, occasionally 
stirring and replacing the water as it evaporates. A saturated solution 
is made in distilled water, there being previously added more citric 
acid* if required; it is then neutralised with liq, amnion, fort.,] and 
concentrated by evaporation : the same plan mentioned at page 214, 
Vol. III., First Series, is followed to complete the process. The first 
part of this process produces a salt of the protoxide of iron, which is 
afterwards converted, by the exposure to the atmosphere, into a citrate 
of the magnetic oxide, and lastly into citrate of peroxide of iron. 
The Chemist. . 
Liquor Ferri Potassio-Citratis. By Dr. John Todd. 
R. Acid, citric, crystallizat., ^j. gv.; 
Potassee carbonatis, £vij.; 
Ferri sesquioxydi, 3j.; 
Sp. ammoniae aromat., q, s.; 
• Aquse distillat., 3xxiv. 
Dissolve the acid, citric, and potass, carb. in. the water; when the 
effervescence has ceased, add the ferri sesquioxydi, and digest for 
* About halt" the weight of the acid first used. 
\ About one ounce and a quarter to every gallon of the solution of a specific 
gravity of 1 .025 . 
