Note 77 — Chapter III · INTERMEDIATE FORMS OF ABSTRACTION.

Wundt (Logik, I., pp. 113 et seq.) gives what he regards as a complete classification of concepts, but it does not correspond with our design. It may be summarised as follows. Four classes: I. Identical or equivalent concepts; Aristotle = Alexander’s tutor. II. Subordinate or superordinate concepts; mammals and vertebrates, etc. III. Co-ordinated concepts, comprising five species: i. Disjunctive concepts; sound and noise, French and German, etc. They are subordinate to a larger concept. ii. Correlative concepts, with reciprocal relations; men and women, mountain and valley. iii. Contrary concepts; high and low, good and bad. iv. Contingent concepts; such, i. e., as touch, with very minute, perceptible differences; this highly important category comprises numbers. v. Interferent concepts, which coincide or partially cross; negro and slave, rectangle and parallelogram. IV. Concepts which are interdependent; etc., space and movement, crime and punishment, demand and supply, labor and wages. This table may suit the logician but not the psychologist, because it presents the concepts under what may be termed the static order, i. e., ready formed: we, on the other hand, are considering them as dynamic, i. e., in their becoming and order of genesis.