EXPERIMENT XIII._Experiments and Observations on the Following Subjects 1. On the preparation, calcination, and medicinal uses of Magnesia Alba. 2. On the solvent qualities of calcined Magnesia. 3. On the variety in the solvent powers of quick-lime, when used in different quantities. 4. On various absorbents, as promoting or retarding putrefaction. 5. On the comparative antiseptic powers of vegetable infusions prepared with lime, &c. 6. On the sweetening properties of fixed air.

In order to determine the quantity of opium thus dissolved, half an

ounce of crude opium, the same quantity of calcined Magnesia, and eight

ounces of distilled water were rubbed for a quarter of an hour in a

glass mortar, and having stood to infuse during two hours, the liquor

was separated through paper. The tincture was of a darker colour than

that before described, and was reduced by a gentle heat to a pilular

consistence. This extract weighed sixty-eight grains, which, allowing

for impurities, for what would be dissipated in evaporation, and for

the air probably absorbed by the Magnesia, is a large proportion to be

so soon dissolved. The residuum which was left in the filter was dried,

and weighed six drachms.

Experiments and Observations on the Following Subjects 1. On the preparation, calcination, and medicinal uses of Magnesia Alba. 2. On the solvent qualities of calcined Magnesia. 3. On the variety in the solvent powers of quick-lime, when used in different quantities. 4. On various absorbents, as promoting or retarding putrefaction. 5. On the comparative antiseptic powers of vegetable infusions prepared with lime, &c. 6. On the sweetening properties of fixed air. · 第 60 / 93 题