19. Relations of Subordination among Ideas in Respect of Their Extension. -- There are degrees in the universality of concepts; those referable to the same category thus form a logical scale.

On the lowest step we find the individual substance, which is not attributable to any subject, and to which all predicates are attributed.

Next above comes the species, which is asserted of the individuals. Then the genus, which is asserted of the subordinate species and the individuals.

The genera (kinds) may in their turn be manifold: nearest, or immediate, genus; or subordinate genera; highest, or most general genus.

Porphyry has drawn up a Table showing the essential predicables of substance and their mutual subordination.

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