EXPERIMENT XVIII._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.

To each of the above tinctures were added forty drops of a strong

solution of sal martis. Number 1 became very black. Number 2 changed

colour but little, and on standing precipitated a brown sediment,

which, the superiour part of the liquor being decanted off, became

again transparent on the addition of a few drops of the vitriolic acid.

Number 3 appeared to strike a deeper black than number 1; and these

being tried as inks, number 3 seemed to have the superiority; but a

slip of linen cloth being macerated in each for some hours, that in

number 1 had taken a more perfect black than the slip number 3. No

trial was made with cotton or woollen, which it is probable would have

differed from the linen.

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 67 / 93 题