Note 128 — Chapter V · EVOLUTION OF THE PRINCIPAL CONCEPTS. (continued 2)

Sigwart in his Logik, Book II. (English translation by Helen Dendy) has made a profound study of the classification of the psychological laws in psychology, and their relative value. He divides them into three categories, according to the nature of the relations which they express: 1. Psychophysical laws which formulate constant relations between states of consciousness and the cerebral states. Ex. the relation between the sensation directly received, and the image that is reproduced in consciousness. 2. Psychological laws properly so-called; these express the internal relations of the states of consciousness. Ex. Law of conservation of impressions, law of association, law of systematisation by volition. 3. Laws expressive of the reciprocal action that human thoughts and volitions exert one upon the other: they presuppose the intervention of social causes, and are to this day vague and ill-determined; hence there are no fixed rules for the government of humanity, or the bringing up of children.