16 
ON PHOSPHATE OF AMMONIA. 
taminating the product, will be good reasons for avoiding 
its use. 
For the process for obtaining phosphoric acid from phos- 
phorus, the reader is referred to the United States Dispensa- 
tory, art. "Acidum Phosphoricum Dilutum" of the London 
College. According to the experiments of George W. An- 
drews, chemist, of Baltimore, one pound of phosphorus 
yields three and a half pounds of phosphate of ammonia, 
which is less than the theoretical quantity, owing, no doubt, 
to the loss of material during the oxidating process. 
It may be as well to state that the usual formula for the 
administration of the phosphate is as follows, viz: 
J& Ammoniae phosphatis, . . . gss. 
Aquae, f.gvj. 
M. ft. solutio. 
The dose of this solution is a table spoonful three times 
a day for an adult. 
ART. III.— PHARMACEUTICAL NOTICES. 
By Augustine Duhamel, 
Laudanum, with and without Narcotine. 
Opium in the form of alcoholic tincture is of such high 
importance as a remedy in popular use and estimation, that 
I feel that any observations respecting its mode of prepara- 
tion, differing from the present observance to " authority," 
must be regarded by some as a useless innovation. Never- 
theless, the experience I have had, and the satisfaction 
consequent upon the good results of preparing and vending 
laudanum freed, almost, if not wholly, from narcotina, the 
noxious principle of opium that occasions all the distressing 
