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THE BOOK OF THE LANTERN, 129 they will form insoluble particles, which will lead to difficulties later on. In the glass tumbler place— Silver nitrate ... 77 grains. Water ... ... 2 ounces. The common tap water employed will, on account of the salts which it contains, turn milky in appearance when the silver is added. This is of no consequence. The crystal* can be crushed under the water by another glass rod, and complete solution will soon be effected. (The tyro must be most careful to keep each stirring rod distinct, or he will spoil the entire work.) When the crystals have all disappeared, pour into the silver solution, drop by drop, some strong liquid ammonia, stirring the solution vigorously all the time. The liquid will turn coffee-coloured, owing to a precipitation of silver oxide, but as more of the ammonia is added this precipitate is redissolved, and the solution becomes as clear as ordinary water. Only just sufficient ammonia should be added to accomplish this result. Now place the glass tumbler in the pan beside the vessel containing the gelatine mixture, and leave it there to warm for about fifteen minutes. All the fore- going operations can be conducted in the full light of day, but now, when the two solutions have to be blended to form a sensitive emulsion of bromide of silver, the light of the red room only must be called into requisition. The flame beneath the pan, or water bath, is now no longer required, so let it be removed. Take both the gela- tine and silver vessels from the pan, and place them on the table. Now stir the gelatine briskly, and add a small K