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Of the eye the white is pretty much the same in all creatures; but
what is called the black differs in various animals. Some have the rim
black, some distinctly blue, some greyish-blue, some greenish; and
this last colour is the sign of an excellent disposition, and is
particularly well adapted for sharpness of vision. Man is the only, or
nearly the only, creature, that has eyes of diverse colours.
Animals, as a rule, have eyes of one colour only. Some horses have
blue eyes.
Of eyes, some are large, some small, some medium-sized; of these,
the medium-sized are the best. Moreover, eyes sometimes protrude,
sometimes recede, sometimes are neither protruding nor receding. Of
these, the receding eye is in all animals the most acute; but the last
kind are the sign of the best disposition. Again, eyes are sometimes
inclined to wink under observation, sometimes to remain open and
staring, and sometimes are disposed neither to wink nor stare. The
last kind are the sign of the best nature, and of the others, the
latter kind indicates impudence, and the former indecision.
11
Furthermore, there is a portion of the head, whereby an animal
hears, a part incapable of breathing, the 'ear'.
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