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Aristotle - On The Parts Of Animals
Atec Февраль 16 2008 20:01:06
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However, as it is necessary that animals shall have bones or something
analogous to them, such as the fish-spines of water-animals, it is
also a matter of necessity that some of these bones shall contain
marrow; for the substance contained within the bones is the
nutriment out of which these are formed. Now the universal
nutriment, as already stated, is blood; and the blood within the bone,
owing to the heat which is developed in it from its being thus
surrounded, undergoes concoction, and self-concocted blood is suet
or lard; so that it is perfectly intelligible how the marrow within
the bone comes to have the character of these substances. So also it
is easy to understand why, in those animals that have strong and
compact bones, some of these should be entirely void of marrow,
while the rest contain but little of it; for here the nutriment is
spent in forming the bones.
Those animals that have fish-spines in place of bones have no
other marrow than that of the chine. For in the first place they
have naturally but a small amount of blood; and secondly the only
hollow fish-spine is that of the chine. In this then marrow is formed;
this being the only spine in which there is space for it, and,
moreover, being the only one which owing to its division into parts
requires a connecting bond. This too is the reason why the marrow of
the chine, as already mentioned, is somewhat different from that of
other bones
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