In the small specimen clay was used next the skin in places to perfect the modelling, but such amounts would be required for a large animal as to affect the durability of the skin. Clay and plaster being in a dry state very absorbent, will eventually rob of all oily matter any skin in contact with them. Such skins will crack, split and finally disintegrate as thoroughly as those having an excess of fat adhering to them.
To prevent this a layer of some glue composition or paper is used just beneath the skin. As an example in this mode of mounting a black bear would answer nicely. If the leg bones are attached to the skin they may be unjointed at the toes and laid aside while the skin is well shaved down on its entire inner surface. A thoroughly flexible skin is entirely at the command of the taxidermist, one stiff or hard cannot be placed or kept in place at will.
After beaming, splitting the lips and nose cartilage, pocketing the ears and sewing up cuts and tears, the skin is dropped in the pickle. An outline sketch is made with chalk on the shop floor and on this the bones of the legs are arranged. A stiff wire bent along the back of each set of leg bones will guide us in bending the iron rods used as supports. These should be from 5/16 to ½ inch in diameter, threaded and fitted with two nuts at the lower end and eighteen inches or so longer than the leg bones themselves.
Of this extra length, enough is allowed below the feet to fasten to the pedestal, the balance is bent in a right angle from the end of the upper leg bone. At the distance of the hip joint from the central line of the body it is bent again parallel with the back board; for a hind leg. The front leg rods are bent in the same way at the joining of the shoulder blade with the humerus or upper bone of the front leg. You will readily see the desirability of preserving at least one set each of the hind and front leg bones. In such case the missing bones can be roughly blocked out of wood to the proper dimensions, while if none are saved you will have to do the same depending on the skin for measurements.
The end of the rods lying along the back should be bent again in a V shape to prevent their turning when fastened to it. The location of the hip and shoulder joints are marked on one side of the back board, the rods for that side laid in place and fastened by drilling holes each side of them and passing loops of stout wire through and twisting them tightly on the other side with heavy pliers. The rods for the other side are fastened in the same manner, in fact they may be fastened with the same wires, but it will be stronger if the fastenings are separate. The leg bones are bound fast to the rods with wire or twine.
Holding the back board in the vise by the middle the leg rods with bone attached are adjusted to the position of the finished specimen. The threaded ends which project below the feet are bent straight down.
A rough pedestal of boards on 2×4 cleats at each end, is made, the frame placed on it and marking where the rods will enter, bore suitable holes to receive them. One nut is turned up each rod a short distance and after inserting in the holes in the pedestal the others are screwed up tightly from below.
Our frame now stands alone and rigid and should be viewed from all sides to correct any errors. It should not be too high, front or rear, and also having the back-board perfectly vertical or plumb. Insert two pieces of rod in the opening at the back of the skull and fasten them there by mixing enough plaster of paris and water to fill the cavity, to the consistency of molasses and pouring it in around them.
The ends of the rods should be bent or roughened to prevent them slipping out after the plaster has set. A surplus of plaster can be placed around the articulation of the jaws, at the same time holding them in place. These neck rods are to run beside and be fastened to the back-board as the legs were.