_To put the Albumen on the Paper._--Take a sheet by two opposite corners; turn one up; place the sheet boldly on the albumen, the centre first coming in contact with the albumen; lower the corners of the paper, gradually carefully excluding, the air. Let the sheet so placed remain four minutes: then take it by the turned up corner, and rip it from the albumen quickly, so as to carry up a quantity of the albumen with it. Let it drain for a minute or two, moving it so as not to allow the albumen to run in streaks; pin it to a piece of tape; and, when dry, pass a very hot iron over the back. This ends the albumenising process. _To make the Paper sensitive._--Place the albumenised side downwards, for four minutes, on the surface of a solution of nitrate of silver, of the strength of ninety grains to the ounce of distilled water; pin it up by one corner to dry, and keep it between pieces of blotting-paper. This must be done by yellow light, or the light of a candle. _To print from the Negative._--The simplest apparatus to have is a number of pieces of plate-glass a quarter of an inch thick, colourless, about twelve inches by ten in size. The sensitive paper is to be placed on one of the plates of glass, sensitive side upwards, and the negative is to be placed firmly upon it, collodion side downwards; and a second glass plate is then to be placed on the negative, and the whole arrangement exposed to the light. The time for exposure is from three minutes to an hour. With a little practice the negative can be lifted up, and the positive viewed front time to time, without any risk of displacement. The best rule is to print the lightest shade on the positive very decidedly darker than it would be wished that it should remain permanently. _To fix the Positive._--On removing it from the pressure frame, place it in a bath made as follows: Water 6 oz. Hyposulphite of soda 1 oz. Nitrate of silver solution, 50 grs. to oz. 15 minims. Iodide of silver, dissolved in a saturated solution of hypo. 10 minims. Chloride of gold 2 grains. Chloride of silver (blackened by light) 5 grains. Acetic acid 2 drops. Mix these: let them stand some hours; and filter before use. If the chloride of silver is omitted, the bath will do very well, but will very much improve with age, as it will acquire chloride of silver from the positives placed in it. {582} The time to leave the positive in the fixing bath varies from one hour to twelve. To get good black and white tints, the average time is five or six hours. When the desired tint is obtained, remove it into a bath composed of Water 6 oz. Hypo. 1 oz.