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THE BOOK OF THE LANTERN. 119 have been so added, set the basin aside for an hour or two, then stir its contents with a glass rod, and test with blue litmus paper, adding crystals of acid until the paper turns slightly red. Add to the liquid 30 grains of potassic bromide, allow to settle, and bottle off for use when clear. But those who wish to avoid the trouble of making their own potassic oxalate can buy the crystals at any photographic dealer's, in which case its solution should be made with boiling water, and well stirred until all crystals have disappeared. One pound of oxalate will require just a quart of water to make a saturated solution. If more water be used, the solution will not be a saturated one, and will, when mixed with the iron, throw down a muddy red precipitate, and be useless for developing pur- poses. The iron must be added to the potash, and not vice versa, or the same effect will be produced. I have found that with this developer it is always advisable to soak the exposed plate in water as a preliminary step. The gelatine surface then takes more kindly to the solution, and greater density is attained. The development should be carried on until the picture looks overdone, for it must be remembered that it has to be ultimately exhibited by transmitted light, and we view it in the developing dish by reflected light only, but hold- ing it up to the red light and looking through it we can judge well when the developing action ought to be stopped. Now follows a rapid rinse under the tap, a few minutes' immersion in alum and water, and fixing in fresh hypo. If ordinary household water has been used, the film will show a milky veil. This is quickly removed by a ten per