1676. Etching on Glass.—Mix in a gallipot a little sulphuric acid and lampblack to a thin smooth paste, and spread a layer of it on a piece of glass; upon which trace with a sharp-pointed instrument, (penetrating to the glass,) any design which may suggest itself.
1677. Then dissolve a little fluor-spar, coarsely powdered, in spirit of turpentine, and with a camel's-hair brush lay some of the solution upon the parts so traced; let it remain an hour or two; and you will find, on scraping off the paste, that the glass will be etched with whatever forms you have traced.
1678. Very pleasing drawings may thus be etched upon glass; and they may be rendered more effective by dusting the outline with a little vermilion.
EMBLEMATIC STONES.
1679. The Jewels of the Months.—In Poland, according to a superstitious belief, each month of the year is under the influence of some precious stone, which influence is attached to the destiny of persons born during the course of the month.