eby causing
the paper to retain its original elasticity.

The chief points of difference between bromide enlargements and silver
or platinum enlargements are that, in the former, we have the sensitive
compound of silver suspended in a vehicle of gelatin, and, in the
latter, a thin coating of an aqueous solution of the sensitive salts.
In the former process, the image is not shown until the paper has been
developed in the bath, while in the latter, the image is shown upon the
paper when it is exposed to the light; so that, in the latter, the
image or picture has only to be fixed or made permanent, while in the
former, it is developed, then fixed. The gelatin bromide paper is
coated with a solution of gelatin, bromide of potassium and nitrate of
silver, developed with a solution of oxalate of potash, protosulphate
of iron, sulphuric acid and bromide of potassium and water, and fixed
with hyposulphate of soda. It is manufactured in America by E. and H.
T. Anthony & Co. and by the Eastman Dry Plate Company.

CRAYON MATERIALS.

The following materials will be found necessary for crayon work:

A good photographic enlargement,
Easel,
Mahl stick,
Three inch magnifying glass,
Square black Conte crayon, Nos. 1, 2 and 3,
Charcoal holder for the same,
Hardmuth's black chalk points, Nos. 1, 2, 3, 4 and 5,
Holder for the same,
Box Faber's crayon points, Nos. 1, 2 and 3,
Holder for the above crayons,
Conte crayon, in wood, Nos. 0 and 1,
6 B. Faber's holder for Siberian lead pencil points,
4 H. Faber's holder with Siberian lead pencil point,
Velour crayon,
Peerless crayon sauce,
Black Conte crayon sauce, in foil,
White crayon, in wood,
Bunch of tortillon stumps,
Large grey paper stumps,
Small grey paper stumps,
The Peerless stump,
Large rubber eraser, 4 inches by 3-4 inches square, bevelled end,
Two small nigrivorine erasers,
Holder for nigrivorine erasers,
Piece of chamois skin,
Cotton batting of the best quality,
A sheet of fine emery paper,
A sharp pen knife,
One pound of pulverized pumice stone,
Mortar and pestle,
A large black apron,
Paste-board box about ten inches square and two inches deep,
Back-boards for mounting crayon paper and photographic enlargements,
Pliers,
Paste brush, three inches wide, to be used for starch paste or for
water.

Experience has