ee, 
OF ARTIFICIAL SKELETONS. 99 
sition of this support must be varied according to the aititude 
in which the skeleton is to be placed. 
In skeletons of the Horse, the Ox, the Hippopotamus, the 
Rhinoceros, the Camel, and the Elephant, the links of wire 
which we have above described, are insufficient to unite their 
bones; for these, two iron pegs are used with a head at one 
| end, and a screw at the other. Each screw is provided with 
-anut, and each pair of screws must have a narrow plate of 
_ iron bored at each end to pass the screw through. Supposing 
the bones of the leg and thigh, of a large quadruped, are to 
| be united, a hole is bored through the apophysis, about two 
| inches from the extremity, and the same having been done 
| with both leg and thigh-bones, they are brought together, and 
| one of the screws passed into one of the holes of the plates 
| 
| which we have mentioned, and then through the perforations 
_ inthe bene, and lastly into the other plate ; they are tightened 
| together by means of the nut. The screws should be nearly 
_ an inch longer than the thickness of the bones. The two ends 
| of the bones are thus united and supported by the two plates | 
which are kept together by the screws. Provision must be 
; _ made for the play of the bones, by leaving a sufficient distance 
in boring the holes, through which the pegs are passed. This 
we have represented in plate II., fig. 3; @ is the iron-plate, 6 | 
the nut, by which the screws of the iron-peg are tightened ; 
ce the head of the other iron-peg, the nut and screw of which 
are placed on the opposite side. 
The Horse and other large animals require a double bar to | 
support them, as represented in plate I., fig. 2, a,a. A bar 
_ is also passed through the vertebre of the neck, spine, and tail, 
and the ribs are attached by means of wires, or flat pieces cf 
plate iron, as seen at b. | 
In these larger animals, the heads are for the most part | 
| sawn through, for tle purpose of studying the structure of the | 
internal cavity and partitions. These are kept together by 
| means of a hinge, so that they can be opened and shut at 
| pleasure. 5 
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