n.

A GOLD PLATE FOR SMALL ARTICLES, WITHOUT A BATTERY.--Digest a small
fragment of gold with about ten times its weight of mercury until it is
dissolved, shake the amalgam together in a bottle, and after cleansing
the articles, coat them uniformly with the amalgam. Then expose them on
an iron tray heated to low redness for a few minutes. The mercury
volatilizes, leaving the gold attached as a thin coating to the
article. The heating should be done in a stove, so that the poisonous
mercurial fumes may pass up the chimney.

A GELATINE MOULD FOR CASTING PLASTER ORNAMENTS.--Allow twelve ounces of
Gelatine to soak for a few hours in water, until it has absorbed as
much as it can, then apply heat, by which it will liquify. If the mould
is required to be elastic, add three ounces of Treacle, and mix well
with the Gelatine. If a little Chrome Alum (precise proportions are
immaterial) be added to the Gelatine, it causes it to lose its property
of being again dissolved in water. A saturated solution of Bichromate
of Potash brushed over the surface of the mould, allowed to become dry
and afterwards exposed to sunlight for a few minutes, renders the
surface so hard as to be unaffected by moisture.

IMITATION OF GROUND GLASS.--The following is from an Antwerp scientific
journal. Paint the glass with the following varnishes: Sandarac
eighteen drachms, Mastic four drachms, Ether twenty-four ounces,
Benzine six to eighteen ounces. The more Benzine the coarser the grain
of imitation glass will be.

UNSHRINKABLE PATTERNS.--The best mixture for small patterns, that does
not shrink in casting, is sixty-nine parts Lead, fifteen and one-half
parts Antimony, fifteen and one-half parts Bismuth, by weight. A cheap
kind for finished patterns can be made of ten parts Zinc, one part
Antimony, one part Tin.

TO MAKE ARTIFICIAL MARBLE FOR PAPER WEIGHTS OR OTHER FANCY
ARTICLES.--Soak Plaster of Paris in a solution of Alum, bake it in an
over, and then grind it to a powder. In using mix it with water, and to
produce the clouds and veins stir in any dry color you wish; this will
become very hard, and is susceptible of a very high polish.

MOLDS OF GLUE AND MOLASSES, SUCH AS RODGERS USES FOR MAKING HIS
STATUETTES.--The flexible moulds referred to are prepared as follows:
Glue eight pounds, Molasses (New Orleans) seven pounds. Soak the Glue
over night in a small quantity of cold water, then melt it by heat over
a salt water bath, stir until froth