Cut rough drawing paper into convenient sizes, and coat each piece on one side, by floating, with a warm solution of gelatine, made by dissolving sheet gelatine in the proportion of 4 gr. to 1 oz. of water and 5 gr. of sodium chloride. After drying spontaneously, the paper is ready for use at any future time.

The sensitising is a very simple and easy process, and a sheet may be got ready for the printing frame within 1/4 hour. Fasten the paper by pins at two corners, with the prepared side uppermost, on a board slightly smaller each way than the sheet, and place this in a sloping position. Pour a small quantity of the sensitiser into a small vessel, such as a wineglass or an egg-cup, and, with a brush well filled with this solution, coat the paper by applying it in transverse strokes, commencing at the top, and working downward. When coated, bring the paper to a vertical position, and suspend it by one corner, attaching a fragment of dry blotting paper to the lower corner to absorb the superfluous liquid. The drying of the paper may be expedited by holding it in front of an ordinary fire. The printing should be carried considerably beyond the strength ultimately required, as much is lost in toning and fixing.

To make the sensitising solution, dissolve 60 gr. of silver nitrate in 1 oz. distilled water, and add carefully drop by drop, and with shaking, strong liquor ammonia, until the solution, which at first becomes, muddy, just clears again. If this stage is accidentally passed, add a trifle more silver.

It is obvious that a brush set in metal would be unfit for this process, but one which is thoroughly efficient and presents the advantage of being renewable for each operation is that known as a Buckle brush (from the name of its inventor), made by taking a piece, of glass tube say 8 in. long and 1/2 in. diameter, and drawing into one end of it, either with a' piece of silver wire bent to form a hook, and long enough to pass through the tube, or with a piece of string, a tuft of cotton wool, the fibres of which have been drawn out lengthwise, the wire or string passing round the middle. When the cotton wool is partially drawn into the tube, where it should fit tightly, it may be pulled into shape, and will be found an excellent tool for the purpose.

A toning bath made with gold chloride and soda bicarbonate is best suited for this paper, and with this, if the toning is carried far enough and the negative is a good one, black- tones, rivaling platinum, may be obtained.

This mode of printing is well adapted to bold and vigorous subjects, and, as the paper does not curl, the pictures may be printed with deep wide margins, rendering mounting unnecessary; the beauty of the photograph being, at the same time, much enhanced by the coarseness of the texture of the white paper. - (J. H. Biggs.)