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. But, as the young animal grows up and
ripens into maturity, the marrow changes its colour, just as do the
external parts and the viscera. For the viscera also in animals, so
long as they are young, have each and all a blood-like look, owing
to the large amount of this fluid which they contain.
The consistency of the marrow agrees with that of the fat. For
when the fat consists of lard, then the marrow also is unctuous and
lard-like; but when the blood is converted by concoction into suet,
and does not assume the form of lard, then the marrow also has a suety
character. In those animals, therefore, that have horns and are
without upper front teeth, the marrow has the character of suet; while
it takes the form of lard in those that have front teeth in both jaws,
and that also have the foot divided into toes. What has ben said
hardly applies to the spinal marrow. For it is necessary that this
shall be continuous and extend without break through the whole
backbone, inasmuch as this bone consists of separate vertebrae. But
were the spinal marrow either of unctuous fat or of suet, it could not
hold together in such a continuous mass as it does, but would either
be too fluid or too frangible.
There are some animals that can hardly be said to have any marrow.
These are those whose bones are strong and solid, as is the case
with the lion. For in this animal the marrow is so utterly
insignificant that the bones look as though they had none at all
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