Vat.gr.244

As the genus, the property, and the accident exist commonly for all the species under them, except that the accident differs from the property and the genus in its calls. For the genus and the property are always in the species under them and are never separated from them.

Note

We say that an accident is that which comes and goes without the destruction of the subject. For the accident is separated from the accident not in [fact], but only in thought. And that is the separable accident; but the inseparable is separated only in thought. For example, we say that the accident is the ability of the animal to exist even without being black. But also to think of the universal animal without being black. Of that, the accident is also said to be wider than the species, and the genus is predicated; for example, "animal" and "white" are said more widely than "man." For there are many animals and many white things.

Definition of the individual

The property is common to some individual. So that the one is said more widely, and the other [in] one. They are distinguished from the particulars in which the individuals are predicated. That which differs is always distinguished from those predicated as species, such as "animal." That which is predicated in the question of "what it is" is separated from the differences and the common accidents, which are in the question of "what kind of thing it is." But the property is predicated in the question of "what" or "how it is disposed," or each of those of which it is predicated.

Look, even there, regarding the nothing, they do not lack encompassing those in the stated things, a description of the cohesion.

Description of the species

Speaking of certain common things from the collection of properties. Of every common thing of which it is predicated, as if a common rendering. For example, man: "rational, mortal, capable of mind and knowledge," having taken the properties and established these from the partial things of each species. And those that commune with man, according to what they commune, all the others—man, horse, and the rest. For "animal" is "sensible of the ensouled." Having taken "man" and "horse," having collected these from the species, it calls it "genus."

Description of the accident

The description of the accident is that which comes and goes without the destruction of the subject. Or that which it is possible for the same thing to exist and not exist. Or that which is neither genus, nor difference, nor species, nor property. But always subsisting in a subject. For example, black on a raven. For black is inseparable from the raven. Not, however, inseparable in thought. For we can conceive of a raven not being black. And the passion and the ecstasy is an accident. And the accident is said to be wider than the species. For "white" is wider than "man." It is wider also than the horse. And "black" is wider than the raven. And wider than ebony. And wider than the Ethiopian. Every accident is in a subject; for there is no accident without a subject.