164 ON CITRATE OP IRON. 
Dissolve the soap in the water by heat; then mix with it 
the alcohol in which the camphor and oil have been previ- 
ously dissolved : lastly, filter. 
ART. XLI. — ON CITRATE OF IRON. 
By Lawrence Turnbull. 
The Citrate of Iron, an elegant preparation, has recently 
been introduced into this city, and prescribed by the medi- 
cal faculty with much success as a tonic. As there are some 
precautions necessary in making this salt, and some opera- 
tors having failed in their endeavors to make it, it is believ- 
ed that the following notice of the process will be accepta- 
ble to the readers of the Journal. 
Take of Citric acid, 4 oz. 
Water, 4 fluid ounces. 
Moist hydrated per oxide of iron, a sufficient 
quantity. 
Dissolve the acid in the water, raise its temperature to 
about 180° Fahr., and gradually add the hydrated perox- 
ide as fast as it is dissolved — by avoiding ebullition the 
oxide is taken up more rapidly, and does not lose that gela- 
tinous consistence so important to its ready combination 
with acids.* When the oxide ceases to be dissolved, filter 
the solution, evaporate it to the consistence of a thick syrup, 
and spread it on plates of glass, so that when dry the laminae 
* Am. Journ. Pharm., vol. xii. page 190. 
