g. it is a property of man relatively to a horse and a
dog. That nothing which may belong to anything else than A is a
convertible predicate of A is clear: for it does not necessarily
follow that if something is asleep it is a man.
A 'genus' is what is predicated in the category of essence of a
number of things exhibiting differences in kind. We should treat as
predicates in the category of essence all such things as it would be
appropriate to mention in reply to the question, 'What is the object
before you?'; as, for example, in the case of man, if asked that
question, it is appropriate to say 'He is an animal'. The question,
'Is one thing in the same genus as another or in a different one?'
is also a 'generic' question; for a question of that kind as well
falls under the same branch of inquiry as the genus: for having argued
that 'animal' is the genus of man, and likewise also of ox, we shall
have argued that they are in the same genus; whereas if we show that
it is the genus of the one but not of the other, we shall have
argued that these things are not in the same genus.
An 'accident' is (i) something which, though it is none of the
foregoing-i.
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