Chromatype. This is a new process of photography, and consists in washing good letter paper with the following solution : Bichromate of potash, 10 grains; sulphate of copper, 20 grains; distilled water, 1 ounce. Papers prepared with this are of a pale yellow colour, and may be kept for any length of time, without injury, and are always ready for use. For copying botanical specimens, or engravings, nothing can be more beautiful. After the paper has been exposed to the influence of sunshine, with the object to be copied superposed, it is washed over in the dark, with a solution of nitrate of silver, of moderate strength; as soon as this is done, a very vivid positive picture makes its appearance, which then only requires washing in pure water.