ON HYDRARGYRUM CUM CRETA. 
without pungency. Its spec. gr. is 0.927. It is volatile, 
and passes off wholly by heat. When inflamed it burns 
with much smoke, leaving a resinous residue. It is soluble 
in ether and alcohol, partially so in strong acetic acid, and 
only sparingly so in water. 
Its principal use, thus far ascertained, has been in 
hemorrhoidal affections, in the dose of three drops on sugar 
three times a day. It does not, however, agree very well 
with the stomach, as experiments in two individual cases 
eventuated in nausea and derangement of the stomach. 
ART. III.—OBSERVATIONS ON STEWART'S FORMULA 
FOR HYDRARGYRUM CUM CRETA. 
By Peter Lehman. 
Read at the Pharmaceutical Meetings Feb, 5th t 1844. 
In the October number of the American Journal of 
Pharmacy, a formula for the preparation of Hydrargyrum 
cum Creta, was published by Mr. David Stewart, of Balti- 
more. In reading it over I was struck with the very large 
proportion of resin directed ; and in order to test the matter 
tried it with one-half the amount there directed, and suc- 
ceeded very well. I subsequently tried one-eighth of the 
quantity, and believe it fully adequate to extinguish the 
mercury in a short time. As the large quantity of resin in 
Mr. Stewart's process requires a proportionably large 
amount of alcohol for its subsequent removal, it is desirable 
to avoid its use. The following formula is proposed: — 
