ewhat larger piece of the same kind, but
with the grain of the wood at right angles to the upper piece, in order to
preserve a perfectly flat surface. On to the upper piece is glued a
covering of japanned-flannel, such as is used for covering tables, taking
care to select for the purpose that which has no raised pattern, the
imitation of rosewood or mahogany being unexceptionable on that account.
The paper can be readily secured to the arrangement alluded to by means of
a couple of pins, one at each of two opposite angles, the wood being
sufficiently soft to admit of their ready penetration.

_To prepare the Albumen._--Take the white of _one_ egg; this dissolve in
one ounce of distilled water, two grains of chloride of sodium (common
salt), and two grains of _grape_ sugar; mix with the egg, whip the whole to
froth, and allow it to stand until it again liquefies. The object of this
operation is to thoroughly incorporate the ingredients, and render the
whole as homogeneous as possible.

A variety in the resulting tone is produced by using ten grains of sugar of
milk instead of the grape sugar.

The albumen mixture is then laid on to the paper by means of a flat
camel's-hair brush, about three inches broad, the mixture being first
poured into a cheese plate, or other flat vessel, and all froth and bubbles
carefully removed from the surface. Four longitudinal strokes with such a
brush, if properly done, will cover the whole half-sheet of paper with an
even thin film; but in case there are any lines formed, the brush may be
passed very lightly over it again in a direction at right angles to the
preceding. The papers should then be allowed to remain on a perfectly level
surface until nearly dry, when they may be suspended for a few minutes
before the fire, to complete the operation. In this condition the glass is
but moderate, and as is generally used; but if, after the first drying
before the fire, the papers are again subjected to precisely the same
process, the negative paper will shine like polished glass. That is coated
again with the albumenizing mixture, and dried as before.

One egg, with the ounce of water, &c., is enough to cover five half-sheets
with two layers, or five whole sheets with one.

I rarely iron my papers, as I do not find any advantage therein, because
the moment the silver solution is applied the albumen becomes coagulated,
and I cannot discover the slightest difference in the final result, except