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. This also, then, will come between the contraries. All
the other intermediates also, therefore, are composite; for that which
has more of a quality than one thing and less than another is
compounded somehow out of the things than which it is said to have
more and less respectively of the quality. And since there are no
other things prior to the contraries and homogeneous with the
intermediates, all intermediates must be compounded out of the
contraries. Therefore also all the inferior classes, both the
contraries and their intermediates, will be compounded out of the
primary contraries.
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