This question is almost the same
as the other, why one contrariety makes things different in species
and another does not, e.g. 'with feet' and 'with wings' do, but
paleness and darkness do not. Perhaps it is because the former are
modifications peculiar to the genus, and the latter are less so. And
since one element is definition and one is matter, contrarieties which
are in the definition make a difference in species, but those which
are in the thing taken as including its matter do not make one. And so
paleness in a man, or darkness, does not make one, nor is there a
difference in species between the pale man and the dark man, not
even if each of them be denoted by one word. For man is here being
considered on his material side, and matter does not create a
difference; for it does not make individual men species of man, though
the flesh and the bones of which this man and that man consist are
other. The concrete thing is other, but not other in species,
because in the definition there is no contrariety. This is the
ultimate indivisible kind. Callias is definition + matter, the pale
man, then, is so also, because it is the individual Callias that is
pale; man, then, is pale only incidentally. Neither do a brazen and
a wooden circle, then, differ in species; and if a brazen triangle and
a wooden circle differ in species, it is not because of the matter,
but because there is a contrariety in the definition. But does the
matter not make things other in species, when it is other in a certain
way, or is there a sense in which it does? For why is this horse other
than this man in species, although their matter is included with their
definitions? Doubtless because there is a contrariety in the
definition.
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