Two forms of intellectual activity: association and dissociation.—Abstraction belongs to the second type. Its positive and negative conditions. It is a case of attention: psychical reinforcement.—It is in embryo in concrete operations: in perception, and the image. Its practical character.—Generalisation belongs to the first type. Problem of the _primum cognitum_; difference or resemblance?—Hierarchy of general ideas: need of a notation. Three great classes.—Lower forms of abstraction and generalisation or pre-linguistic period, characterised by absence of words 1 Different observations. Numeration in animals; what does it consist of?—Mode of formation and characteristics of generic images.…
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