In a preceding contribution to the _Revue Philosophique_ (May, 1890) M. Payot showed that sensation is the translation into terms of consciousness of that which, considered from the objective point of view, is a reaction of the organism, as a whole, to an external impression. Sensations are the irreducible element of the psychic life. They contribute the materials which the mind modifies, combines, and classes according to their relations, variable or invariable. This is chronologically posterior to sensation, which has an affective origin. The reactions corresponding to the most frequent sensations become more and more rapid until consciousness, “which translates only physiological states of a sufficient duration,” has not time to appear. Here we have a reflex-act. In an intermediate zone where reactions take a time sufficient for them to be conscious, the intellectual states, to which the abstract name of the intellectual faculty has been given, have birth. Differentiation operates between sensible and intellectual facts, until they seem to belong to two irreducible faculties; but the intellectual states are grafted on the sensible states, and although the graft develops so greatly that the sensibility appears like a parasite, the latter is the primitive trunk and through it the graft exists by a kind of continued creation. Sensations are convenient abstractions but nothing more. A sensation never presents itself in the adult consciousness without a crowd of instantaneously evoked relations. There is never absolute exclusion between perception and sensation: these are two states which dissolve into each other, which have no difference in nature, and which are separable only in gross. Properly speaking there are no sensations, only perceptions more or less complex. In sensation the state of mind is considered in itself without reference to its relations; in perception attention is paid chiefly to the relations. But sensation exists only for consciousness, as it can never enter directly into intellectual constructions, but only through the state of remembrance. Every sensation so far as we are sensible of it is purely felt, and we effectuate our mental constructions not with sensations, but with our remembrances of sensations. But the rôle of sensation is still more restricted. However rapid its flight across consciousness it instantaneously provokes the remembrance of numerous sensations of differences and resemblances with anterior sensations. It is an occasion for this, and nothing more. To be perceived, a sensation must be followed by sensations different from itself. The mind seizes relations of resemblance between sensations and resemblances between relations: it classes them, the chaos unravels and organises itself. The organisation has been progressive, but at all stages the procedure is alike; it consists in disengaging remembrances more or less masked by dissimilarities: this is the universal procedure of the mind and the