Substance, in the truest and primary and most definite sense of the
word, is that which is neither predicable of a subject nor present
in a subject; for instance, the individual man or horse. But in a
secondary sense those things are called substances within which, as
species, the primary substances are included; also those which, as
genera, include the species. For instance, the individual man is included
in the species 'man', and the genus to which the species belongs is
'animal'; these, therefore-that is to say, the species 'man' and the