It is impossible to preserve the iridescent tints of the living specimens; but before proceeding to the operation of skinning, it may be stated that the scales, as well as their color, may be preserved to a certain degree by applying tissue-paper to them, which, from the natural glutinous matter which covers the scales, will adhere firmly; this being allowed to remain until the skin has dried, may easily be removed by moistening with a damp cloth. All small fish should be mounted in section, while the larger varieties may be preserved entire. Supposing the fish to be of such a size as to be mounted in section, first it is necessary that it be as fresh as possible, as the scales will become detached if decay set in. Place the fish on one side, and cover the side uppermost with tissue-paper, as above stated; also extend the fins by means of the same, and allow them to remain a few moments until fixed and dry. Having provided yourself with a damp cloth, spread it smoothly upon the table, and place the fish upon it, papered side down. With the dissecting scissors, cut the skin along an oval line, following the contour of the body, but a little below the extreme dorsal edge and a little above the ventral one, and remove the skin included within this line. The remaining skin must now be detached from the flesh, beginning at the head and separating it downward toward the tail. The spine must be severed close to the head, and also at the tail, and the entire body removed. All the flesh having been taken from the skin, and the eyes removed, the inside must be wiped out and the preservative (arsenical soap) applied. The skin should now be filled with tow, very evenly placed. When filled, it should be laid, with the open side down, upon a board of proper dimensions, and fastened to it by small tacks, beginning at the head and fastening the edges downward toward the tail. It should then be set aside to dry. The paper is, after drying, removed, and eyes of wood (painted to the proper colors, and not varnished) are inserted with a little putty. Finally the skin should receive a coat of colorless varnish, when the specimen is ready for the cabinet.