1). Here would be the upper part of the animal--that great mass of
bones that we spoke of as the spine (a, Fig. 1). Here I should have
the alimentary canal (b, Fig. 1). Here I should have the heart (c,
Fig. 1); and then you see, there would be a kind of double tube, the
whole being inclosed within the hide; the spinal marrow would be placed
in the upper tube (a, Fig. 1), and in the lower tube (d d, Fig. 1),
there would be the alimentary canal (b), and the heart (c); and here I
shall have the legs proceeding from each side. For simplicity's sake,
I represent them merely as stumps (e e, Fig. 1). Now that is a
horse--as mathematicians would say--reduced to its most simple
expression. Carry that in your minds, if you please, as a simplified
idea of the structure of the Horse. The considerations which I have
now put before you belong to what we technically call the 'Anatomy' of
the Horse. Now, suppose we go to work upon these several parts,--flesh
and hair, and skin and bone, and lay open these various organs with our
scalpels, and examine them by means of our magnifying- glasses, and see
what we can make of them.
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