Albumen, 1 oz.; water, 16 oz. Place in a bottle with some broken glass, and shake vigorously until all the flocculent matter is thoroughly cut up; then add 10 gr. of ammonia chloride to every ounce of solution, and, after shaking well, strain through two thicknesses of fine muslin. This salting bath, although simple, will yield the best results. It will tone quickly and easily with but very little gold. With this bath a beautiful neutral tone can easily be obtained; or, in fact, any tone from a dark sepia to a positive black.

After filtering, pour your solution in a tray large enough for the sheets you intend to coat, being careful to remove all air bubbles. Now immerse the sheet in the solution for one minute, then draw out quickly by two corners and hang up by means of a clip to dry. After it has thoroughly dried, float the right side of the paper on the solution for two minutes.

The paper has a "right" and a "wrong" side, which can easily be distinguished after the first bath by the grain of the paper, the smooth side being the right one to float the second time. Now hang up to dry again in the same manner as before. You can salt any quantity of the paper, as it keeps indefinitely if kept in a dry place.

The sensitising bath should be an ordinary neutral bath, 50 gr. to the ounce, and kept neutral by the addition of soda carbonate; it is prepared as follows: - Take the amount of water that you wish for the bath (about 10 oz.) and add silver nitrate until an "actmo-meter "shows it to be 50 gr. to the ounce. Neutralise by adding enough of a saturated solution of soda carbonate to form a slight precipitate (about 10 or 15 drops). The precipitate which is produced should be left in the bottle. Shake well, and after the bath has settled it is ready for use. You can cither filter or decant the clear solution into your silvering tray.

Float the paper 3 minutes on this solution, using the same precautions as when floating albumen paper, being careful not to get any of the solution on the back of the paper.

It is a good plan to place one end of the paper on the bath first, then lower carefully until the entire sheet is in perfect contact with the bath, this will force any bubbles, should there be any, from under the sheet. While the sheet is in contact, raise the corners separately to see if there are any; if so, they should be broken with the finger or a glass rod.

The sensitising bath should be tested from time to time and kept up to the required strength by the addition of fresh silver nitrate. It will be neutral as long as there is any excess of soda carbonate in the bath.

After sensitising, dry the paper thoroughly, and keep in a dry, dark place. If kept in a perfectly dry state it will last for several days; but when it can be, it should be used at once, to ensure the best results. The sensitising operations may be safely carried on by lamp light.