nt of the printed lines upon
the surface of the gelatine by water; and fourth, the casting of a copy of
the developed gelatine sheet in metal, the metal so produced being used
for printing on the press in the ordinary manner. All this is very simple,
and in the hands of experienced and skilled persons very beautiful
examples of printing plates, having all the fineness and artistic effect
of superior hand engraved work, may be produced.

HOW TO SPLIT A SHEET OF PAPER.

Get a piece of plate glass and place on it a sheet of paper; then let the
paper be thoroughly soaked. With care and a little dexterity the sheet can
be split by the top surface being removed. But the best plan is to paste a
piece of cloth or strong paper on each side of the sheet to be split. When
dry, violently and without hesitation pull the two pieces asunder, when
part of the sheet will be found to have adhered to one and part to the
other. Soften the paste in water and the pieces can be easily removed
from the cloth. The process is generally demonstrated as a matter of
curiosity, yet it can be utilized in various ways. If we want to paste in
a scrap book a newspaper article printed on both sides of the paper, and
possess only one copy, it is very convenient to know how to detach the one
side from the other. The paper, when split, as may be imagined, is more
transparent than it was before being subjected to the operation, and the
printing ink is somewhat duller; otherwise the two pieces present the
appearance of the original if again brought together.

ANILINE INK PAPER.

To make aniline ink paper thick filtering paper is soaked in a very
concentrated solution of an aniline dye and allowed to dry; it may then be
soaked again to make it absorb more color. With a little attention it will
not be difficult to prepare the paper so as to have a known quantity of
coloring matter in a square of a given size. Paper prepared as above is
very convenient to have when traveling; when one wishes to write, it is
only necessary to tear off a small piece of the paper and let it soak in a
little water. Aniline blue paper may also be employed conveniently for
bluing in washing.

TO MAKE INCOMBUSTIBLE WRITING AND PRINTING PAPER.

To make incombustible writing and printing paper, asbestos of the best
quality is treated with potassium permanganate and then with sulphuric
acid. About ninety-five per cent of such asbestos is mixed with five per
cent of wood pulp i