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. (E.g. if white and black are contraries, and one is a
piercing colour and the other a compressing colour, these
differentiae-'piercing' and 'compressing'-are prior; so that these are
prior contraries of one another.) But, again, the species which differ
contrariwise are the more truly contrary species. And the
other.species, i.e. the intermediates, must be composed of their genus
and their differentiae. (E.g. all colours which are between white
and black must be said to be composed of the genus, i.e. colour, and
certain differentiae. But these differentiae will not be the primary
contraries; otherwise every colour would be either white or black.
They are different, then, from the primary contraries; and therefore
they will be between the primary contraries; the primary
differentiae are 'piercing' and 'compressing'.)
Therefore it is (b) with regard to these contraries which do not
fall within a genus that we must first ask of what their intermediates
are composed. (For things which are in the same genus must be composed
of terms in which the genus is not an element, or else be themselves
incomposite.) Now contraries do not involve one another in their
composition, and are therefore first principles; but the intermediates
are either all incomposite, or none of them. But there is something
compounded out of the contraries, so that there can be a change from a
contrary to it sooner than to the other contrary; for it will have
less of the quality in question than the one contrary and more than
the other
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