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. The variations of the blood may be selected to illustrate
this. For different bloods differ in their degrees of thinness or
thickness, of clearness or turbidity, of coldness or heat; and this
whether we compare the bloods from different parts of the same
individual or the bloods of different animals. For, in the individual,
all the differences just enumerated distinguish the blood of the upper
and of the lower halves of the body; and, dealing with classes, one
section of animals is sanguineous, while the other has no blood, but
only something resembling it in its place. As regards the results of
such differences, the thicker and the hotter blood is, the more
conducive is it to strength, while in proportion to its thinness and
its coldness is its suitability for sensation and intelligence. A like
distinction exists also in the fluid which is analogous to blood. This
explains how it is that bees and other similar creatures are of a more
intelligent nature than many sanguineous animals; and that, of
sanguineous animals, those are the most intelligent whose blood is
thin and cold. Noblest of all are those whose blood is hot, and at the
same time thin and clear. For such are suited alike for the
development of courage and of intelligence. Accordingly, the upper
parts are superior in these respects to the lower, the male superior
to the female, and the right side to the left. As with the blood so
also with the other parts, homogeneous and heterogeneous alike
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