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At the close, formulas will be given for those who desire to work out their own salvation. 2. An ounce bottle of potassium bromide. Take an empty ounce bottle, fill one-fourth of it with bromide crystals and then fill up with water. Shake it thoroughly; if all the crystals dissolve, put in some more and shake again. In a short time one can be satisfied that no more crystals will dissolve. When this state of affairs is reached, the solution is said to be "saturated." And a saturated solution of the bromide is what is wanted. Mark the bottle " bromide solution." It is used in connection with the developer. 3. The acid sulphite of soda is used in con- nection with hyposulphite of soda. 4. A solution of hyposulphite of soda, com- monly called "hypo," or the fixing solution. Take 8 ounces of hypo, put it in 32 ounces of water and shake until the crystals are dissolved, then add half a drachm of the acid sulphite of soda. Mark this bottle "hypo solution." The acid sulphite keeps the hypo solution clear, so that there is no danger of staining the plates. A very small quantity is sufficient, too much is an evil. Hypo is very cheap, so don't work it to death. A fresh solution should be made every day or two if many plates are fixed, and a fresh solution is always safer even if only a few plates are to be fixed. Never use it if the solution is yellow or brown. 5. Put powdered alum into a pint bottle of water until no more will dissolve and some undissolved powder remains on the bottom of the bottle.