For there is always
more earth in the composition of these animals than in that of the
human body. However, not only all these parts but such others as are
nearly connected with them, skin for instance, bladder, membrane,
hairs, feathers, and their analogues, and any other similar parts that
there may be, will be considered farther on with the heterogeneous
parts. There we shall inquire into the causes which produce them,
and into the objects of their presence severally in the bodies of
animals. For, as with the heterogeneous parts, so with these, it is
from a consideration of their functions that alone we can derive any
knowledge of them. The reason for dealing with them at all in this
part of the treatise, and classifying them with the homogeneous parts,
is that under one and the same name are confounded the entire organs
and the substances of which they are composed. But of all these
substances flesh and bone form the basis. Semen and milk were also
passed over when we were considering the homogeneous fluids. For the
treatise on Generation will afford a more suitable place for their
examination, seeing that the former of the two is the very
foundation of the thing generated, while the latter is its
nourishment.
10
Let us now make, as it were, a fresh beginning, and consider the
heterogeneous parts, taking those first which are the first in
importance.
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