one, and allowed to stand for fourteen days at
a moderate temperature, after which the clear solution is poured off.
Three parts of this solution are mixed with four parts of thick collodian,
and the mixture allowed to become clear by standing. It is applied with a
soft hair brush in vertical strokes. At first the coating looks like a
thin, white film, but on complete drying it becomes transparent and
shining. It should be laid on two or three times. It retains its
elasticity under all circumstances, and remains glossy in every kind of
weather.

TO REMOVE GREASE SPOTS FROM PAPER.

The following is a recipe for removing grease spots from paper:--Scrape
finely some pipe clay on the sheet of paper which is to be cleaned. Let it
completely cover it, then lay a thin piece of paper over it, and pass a
heated iron on it for a few seconds. Then take a perfectly clean piece of
India rubber and rub off the pipe clay. In most cases one application will
be found sufficient, but if it is not, repeat it.

PAPER FOR TAKING OUT INK STAINS.

Thick blotting paper is soaked in a concentrated solution of oxalic acid
and dried. Laid immediately on a blot it takes it out without leaving a
trace behind.

QUALITIES OF GOOD PAPER.

A good paper ought to feel tight and healthy, not clammy and soft, as if a
little muscle were required. Paper-makers say that a good paper has
"plenty of guts" in it, a forcible if not extremely polite expression. In
buying a good paper always look out for the "guts." Clay gives paper a
soft feel. Perhaps the first qualification about a good writing paper is
its cleanliness and freedom from specks of all kinds. A dirty paper is
never salable except to dirty people and firms who don't mind using dirty
materials.

PASTE FOR LABELS.

For adhesive labels dissolve 1-1/2 ozs. common glue, which has laid a day
in cold water, with some candy sugar, and 3/4 oz. gum arabic, in 6 ounces
hot water, stirring constantly till the whole is homogeneous. If this
paste is applied to labels with a brush and allowed to dry, they will then
be ready for use by merely moistening with the tongue.

HOW TO PRODUCE ENGRAVINGS OR TYPES FOR PRINTING BY PHOTOGRAPHY

The process of producing engravings or types for printing by photography
consists first, in making a sharp negative of the picture to be engraved;
second, in the photographic printing of a sheet of sensitized gelatine by
means of the negative; third, the developme