STUFFING.
The skins, being properly anointed, are filled with tow or cotton. This must be so managed that there will be no prominences on the outside of the skin, which in fishes, is smooth and even for the most part. When properly filled, they must be sewed up, and set aside to dry in the air, but not exposed to the rays of the sun. In a few days, the papers with which the fins were extended are taken off, by damping them with a sponge. The glass eyes are now introduced, after filling the orbits with cotton and a little cement to secure them in their places. The skins may then be coated with turpentine varnish.
Sharks.—In stuffing these large fishes, it is necessary to use a stick for a center support. This must also enter the head, through the opening of the throat. If it is intended that the specimen shall be suspended from the ceiling, wire-hooks must be fastened into the wood. From these must be placed upright wires, so that they penetrate the skin, and pass through the back. Let the whole internal surface of the skin be well rubbed with the preservative. The body is then stuffed to its full size, and afterwards sewed up. The stuffing of the head must be completed through the orbits of the eyes, and also by the mouth. This finished, the glass eyes are inserted, as in other animals, and fixed by means of cement.
Many species of fish have semi-transparent cartilages connected with the eyes. These must be imitated with gum-arabic and powdered starch, as well as the cornea of the eyes.
The skins of all fish, which are similar to that of sharks, must be well supplied with spirits of turpentine, after they are mounted, more particularly the head and fins; but as they are not glossy, they do not require to be varnished.
When the fins are strong, it is necessary to keep them extended by means of a wire introduced through them.
In the Diadons, the chief thing to be attended to, beyond what we have stated, is, to take care that the spines, with which their skins are beset, are not broken or depressed in any way.
Salmon, Trout, Tench, Carp, Pike, etc., are very easily preserved, as the scales are firmly attached to the skin; and although they become somewhat dim from drying, their colors and brilliancy are considerably restored by means of varnish, if applied before they are thoroughly dried.
After a lapse of time, the varnish will rise into little scales; to remove these, nitric acid, diluted in water, must be applied to the whole external surface, which has the effect of completely taking off the varnish, or at least of raising it from the skin, which, when allowed to dry, can be wholly removed by rubbing it with a small brush. It may then be varnished again; when dry, it will ever afterwards continue quite solid.