Isagoge: Chapter 6 — Of Things common and peculiar to the Five Predicates

This chapter is both simple and straightforward:

Having discussed all that were proposed, I mean, genus, species, difference, property, accident, we must declare what things are common, and what peculiar to them. Now it is common to them all to be predicated, as we have said, of many things, but genus (is predicated) of the species and individuals under it, and difference in like manner; but species, of the individuals under it; and property, both of the species, of which it is the property, and of the individuals under that species; again, accident (is predicated) both of species, and individuals. For animal is predicated of horse and ox, being species, also of this particular horse and ox, which are individuals, but irrational is predicated of horse and ox, and of particulars. Species however, as man, is predicated of particulars alone, but property both of the species, of which it is the property, and of the individuals under that species; as risibility both of man, and of particular men, but blackness of the species of crows, and of particulars, being an inseparable accident; and to be moved, of man and horse, being a separable accident. Notwithstanding, it is pre-eminently (predicated) of individuals, but secondarily of those things which comprehend individuals.

In short:

  • Genus is predicated of:
    • The species within it: Man is an animal.
    • The individuals within it: Socrates is an animal; Trigger is an animal.
  • Species is predicated of:
    • The individuals within the species: Socrates is a man.
  • Difference is predicated of:
    • The species of which it is the difference: Man is rational.
    • The individuals within that species: Socrates is rational.
  • Property is predicated of:
    • The species of which it is a property: Man can laugh.
    • The individuals within that species: Socrates can laugh.
  • Accident is predicated of:
    • The species of which it is an inseparable accident: Crows are black.
    • Individuals: This crow is flying.

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