This kind of synthesis, this superposition and mixture of images into notions of physical objects, is not, however, the only kind to which perceptions are subject. They fall together by virtue of their qualitative identity even before their spatial superposition; for in order to be known as repeatedly simultaneous, and associable by contiguity, they must be associated by similarity and known as individually repeated. The various recurrences of a sensation must be recognised as recurrences, and this implies the collection of sensations into classes of similars and the apperception of a common nature in several data. Now the more frequent a perception is the harder it will be to discriminate in memory its past occurrences from one another, and yet the more readily will its present recurrence be recognised as familiar. The perception in sense will consequently be received as a repetition not of any single earlier sensation but of a familiar and generic experience. This experience, a spontaneous reconstruction based on all previous sensations of that kind, will be the one habitual idea with which recurring sensations will be henceforth identified. Such a living concretion of similars succeeding one another in time, is the idea of a nature or quality, the universal falsely supposed to be an abstraction from physical objects, which in truth are conceived by putting together these very ideas into a spatial and permanent system.
Here we have, if I am not mistaken, the origin of the two terms most prominent in human knowledge, ideas and things. Two methods of conception divide our attention in common life; science and philosophy develop both, although often with an unjustifiable bias in favour of one or the other. They are nothing but the old principles of Aristotelian psychology, association by similarity and association by contiguity. Only now, after logicians have exhausted their ingenuity in criticising them and psychologists in applying them, we may go back of the traditional position and apply the ancient principles at a deeper stage of mental life.
Similar reactions, merged in one habit of reproduction, yield an idea.
Association by similarity is a fusion of impressions merging what is common in them, interchanging what is peculiar, and cancelling in the end what is incompatible; so that any excitement reaching that centre revives one generic reaction which yields the idea. These concrete generalities are actual feelings, the first terms in mental discourse, the first distinguishable particulars in knowledge, and the first bearers of names. Intellectual dominion of the conscious stream begins with the act of recognising these pervasive entities, which having character and ideal permanence can furnish common points of reference for different moments of discourse. Save for ideas no perception could have significance, or acquire that indicative force which we call knowledge. For it would refer to nothing to which another perception might also have referred; and so long as perceptions have no common reference, so long as successive moments do not enrich by their contributions the same object of thought, evidently experience, in the pregnant sense of the word, is impossible. No fund of valid ideas, no wisdom, could in that case be acquired by living.
Ideas are ideal.
Ideas, although their material is of course sensuous, are not sensations nor perceptions nor objects of any possible immediate experience: they are creatures of intelligence, goals of thought, ideal terms which cogitation and action circle about. As the centre of mass is a body, while it may by chance coincide with one or another of its atoms, is no atom itself and no material constituent of the bulk that obeys its motion, so an idea, the centre of mass of a certain mental system, is no material fragment of that system, but an ideal term of reference and signification by allegiance to which the details of consciousness first become parts of a system and of a thought. An idea is an ideal. It represents a functional relation in the diffuse existences to which it gives a name and a rational value. An idea is an expression of life, and shares with life that transitive and elusive nature which defies definition by mere enumeration of its materials. The peculiarity of life is that it lives; and thought also, when living, passes out of itself and directs itself on the ideal, on the eventual. It is an activity. Activity does not consist in velocity of change but in constancy of purpose; in the conspiracy of many moments and many processes toward one ideal harmony and one concomitant ideal result. The most rudimentary apperception, recognition, or expectation, is already a case of representative cognition, of transitive thought resting in a permanent essence. Memory is an obvious case of the same thing; for the past, in its truth, is a system of experiences in relation, a system now non-existent and never, as a system, itself experienced, yet confronted in retrospect and made the ideal object and standard for all historical thinking.
So-called abstractions complete facts.
These arrested and recognisable ideas, concretions of similars succeeding one another in time, are not abstractions; but they may come to be regarded as such after the other kind of concretions in experience, concretions of superposed perceptions in space, have become the leading objects of attention. The sensuous material for both concretions is the same; the perception which, recurring in different objects otherwise not retained in memory gives the idea of roundness, is the same perception which helps to constitute the spatial concretion called the sun. Roundness may therefore be carelessly called an abstraction from the real object “sun”; whereas the peculiar optical and muscular feelings by which the sense of roundness is constituted—probably feelings of gyration and perpetual unbroken movement—are much earlier than any solar observations; they are a self-sufficing element in experience which, by repetition in various accidental contests, has come to be recognised and named, and to be a characteristic by virtue of which more complex objects can be distinguished and defined. The idea of the sun is a much later product, and the real sun is so far from being an original datum from which roundness is abstracted, that it is an ulterior and quite ideal construction, a spatial concretion into which the logical concretion roundness enters as a prior and independent factor. Roundness may be felt in the dark, by a mere suggestion of motion, and is a complete experience in itself. When this recognisable experience happens to be associated by contiguity with other recognisable experiences of heat, light, height, and yellowness, and these various independent objects are projected into the same portion of a real space; then a concretion occurs, and these ideas being recognised in that region and finding a momentary embodiment there, become the qualities of a thing.
A conceived thing is doubly a product of mind, more a product of mind, if you will, than an idea, since ideas arise, so to speak, by the mind’s inertia and conceptions of things by its activity.
Things concretions of concretions.