or the individual horse. But, to speak more generally, that which
is individual and has the character of a unit is never predicable
of a subject. Yet in some cases there is nothing to prevent such
being present in a subject. Thus a certain point of grammatical
knowledge is present in a subject.

Part 3

When one thing is predicated of another, all that which is
predicable of the predicate will be predicable also of the
subject. Thus, 'man' is predicated of the individual man; but
'animal' is predicated of 'man'; it will, therefore, be
predicable of the individual man also: for the individual man is
both 'man' and 'animal'.

If genera are different and co-ordinate, their differentiae are
themselves different in kind. Take as an instance the genus
'animal' and the genus 'knowledge'. 'With feet', 'two-footed',
'winged', 'aquatic', are differentiae of 'animal'; the species of
knowledge are not distinguished by the same differentiae. One
species of knowledge does not differ from another in being
'two-footed'.

But where one genus is subordinate to another, there is nothing
to prevent their having the same differentiae: for the greater
class is predicated of the lesser, so that all the differentiae
of the predicate will be differentiae also of the subject.

Part 4