The only apparatus required by the photographic artist for the preparation of his papers, are—some very soft sponge brushes and large camel hair pencils (no metal should be employed in mounting the brushes, as it decomposes the silver salts), a wide shallow vessel capable of receiving the sheet without folds, a few smooth planed boards, sufficiently large to stretch the paper upon, and a porcelain or glass slab. He must supply himself with a quantity of good white blotting-paper, and several pieces of soft linen or cotton cloth; a box of pins; a glass rod or two ; some porcelain capsules; and some beaker glasses, graduated measures, scales, and weights.