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. And this identical thing is genus or species; for everything
that differs differs either in genus or in species, in genus if the
things have not their matter in common and are not generated out of
each other (i.e. if they belong to different figures of
predication), and in species if they have the same genus ('genus'
meaning that identical thing which is essentially predicated of both
the different things).
Contraries are different, and contrariety is a kind of difference.
That we are right in this supposition is shown by induction. For all
of these too are seen to be different; they are not merely other,
but some are other in genus, and others are in the same line of
predication, and therefore in the same genus, and the same in genus.
We have distinguished elsewhere what sort of things are the same or
other in genus.
4
Since things which differ may differ from one another more or
less, there is also a greatest difference, and this I call
contrariety. That contrariety is the greatest difference is made clear
by induction. For things which differ in genus have no way to one
another, but are too far distant and are not comparable; and for
things that differ in species the extremes from which generation takes
place are the contraries, and the distance between extremes-and
therefore that between the contraries-is the greatest.
But surely that which is greatest in each class is complete
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