er the paper fit for copying without being made wet, to the
acetate solution chromic acid or ferro-cyanide of potassium is added.

TO REMOVE INK SPOTS.

First moisten the blots with a strong solution of oxalic acid, then with a
clear saturated aqueous solution of fresh chloride of lime--bleaching
powder. Absorb excess of the liquids from the paper as quickly as possible
with a clean piece of blotting paper. Repeat the treatment if necessary,
and dry thoroughly between blotting pads under pressure.

ELECTRO GILDING IN COLORS.

Electro-gilding in various colors may be readily effected by adding to the
gold bath small quantities of copper or silver solution until the desired
tint is obtained. A little silver solution added to the gilding bath
causes the deposit to assume a pale yellow tint. By increasing the dose of
silver solution a pale greenish tint is obtained. Copper solution added to
the gold bath yields a warm, red gold tint. It is best to use a current of
rather high tension, such as that of the Bunsen battery, for depositing
the alloy of gold and copper.

TO REMOVE OIL MARKS FROM PAPER.

Oil marks on wall paper, where careless persons have rested their heads,
may be removed by making a paste of cold water and pipe clay or fuller's
earth, and laying it on the stains without rubbing it in; leave it on all
night, and in the morning it can be brushed off, and the spot, unless it
be a very old one, will have disappeared. If old, renew the application.

TO REMOVE INK STAINS FROM MAHOGANY.

To remove ink stains from mahogany apply carefully with a feather a
mixture of a teaspoonful of water and a few drops of nitre, and rub
quickly with a damp cloth.

SOLID POCKET GLUE.

Is made from 600 grams of glue and 250 grams of sugar. The glue is at
first completely dissolved by boiling with water; the sugar is then
introduced into the hot solution, and the mixture evaporated until it
becomes solid on cooling. The hard mass dissolves very rapidly in lukewarm
water, and then gives a paste which is especially adapted for paper.

TO TEST GLUE.

An article of glue which will stand damp atmosphere is a desideratum among
mechanics. Few know how to judge of quality except by the price they pay
for it. But price is no criterion; neither is color, upon which so many
depend. Its adhesive and lasting properties depend more upon the material
from which it is made, and the method of securing purity in the raw
material