Forms of speech are either simple or composite. Examples of the
latter are such expressions as 'the man runs', 'the man wins'; of
the former 'man', 'ox', 'runs', 'wins'.
Of things themselves some are predicable of a subject, and are
never present in a subject. Thus 'man' is predicable of the
individual man, and is never present in a subject.
By being 'present in a subject' I do not mean present as parts
are present in a whole, but being incapable of existence apart
from the said subject.
Some things, again, are present in a subject, but are never
predicable of a subject. For instance, a certain point of
grammatical knowledge is present in the mind, but is not
predicable of any subject; or again, a certain whiteness may be
present in the body (for colour requires a material basis), yet
it is never predicable of anything.
Other things, again, are both predicable of a subject and present
in a subject. Thus while knowledge is present in the human mind,
it is predicable of grammar.
There is, lastly, a class of things which are neither present in
a subject nor predicable of a subject, such as the individual man
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.