size, to the depth of one-half
inch.

_Recipe for Ink to Be Used._--Violet Analine forty grains, Gum Arabic
twelve grains, Alcohol one-fourth ounce, Water one-half ounce. Dissolve
the Gum in the Water and Alcohol, then add the Analine. Shake in a
bottle from time to time until the Analine is dissolved.

_To work the Copying Pad._--Write with ink on any good paper, press the
written surface on the pad and allow it to remain two minutes; then
take off and the writing will remain, from which impressions may be
taken by laying on plain paper, and smoothing with the hand. As soon as
the last impression is taken be sure and wash off with a wet sponge.

TO BORE HOLES IN GLASS.--Any hard steel tool will cut glass with great
facility when kept freely wet with camphor dissolved in turpentine. A
drill bow may be used, or even the hand alone. A hole bored may be
readily enlarged by a round file. The ragged edges of glass vessels may
also be thus easily smoothed by a flat file. Flat window glass can be
readily sawed by a watch spring saw by aid of this solution. In short
the most brittle glass can be wrought almost as easily as brass by the
use of cutting tools kept constantly moist with Camphorized Oil of
Turpentine.

TO ETCH UPON GLASS.--Procure several thick, clear pieces of crown
glass; and immerse them in Melted Wax, so that they may receive a
complete coating, or pour over them a solution of Wax in Benzine. When
perfectly cold draw on them with a fine steel point, flowers, trees,
houses, portraits, etc. Whatever parts of the drawings are intended to
be corroded with the acid should be perfectly free from the least
particle of wax. When all these drawings are finished the pieces of
glass must be immersed one by one in a square leaden box or receiver,
where they are to be submitted to the action of Hydroflouric Acid Gas,
made by acting on Powdered Flour-Spar by Concentrated Sulphuric Acid.
When the glasses are sufficiently corroded, they are to be taken out,
and the wax is to be removed by first dipping them in warm and then in
hot water, or by washing with turpentine or benzine. Various colors may
be applied to the corroded parts of the glass, whereby a fine painting
may be executed. In the same manner sentences and initials of names may
be etched on wine-glasses, tumblers, etc.

RUBBER HAND STAMPS.--Set up the desired name and address in common
type, oil the type, and place a guard about one-half inch high around
the for