It is unnecessary to add that the similarity established here between the will and the imagination is only partial and has as its aim only to bring to light the role of the motor elements. Surely no one will confuse two aspects of our psychic life that are so distinct, and it would be foolish to delay in order to enumerate the differences. The characteristic of novelty should by itself suffice, since it is the special and indispensable mark of invention, and for volition is only accessory: The extraction of a tooth requires of the patient as much effort the second time as the first, although it is no longer a novelty. After these preliminary remarks we must go on to the analysis of the creative imagination, in order to understand its nature in so far as that is accessible with our existing means. It is, indeed, a tertiary formation in mental life, if we assume a primary layer (sensations and simple emotions), and a secondary (images and their associations, certain elementary logical operations, etc.). Being composite, it may be decomposed into its constituent elements, which we shall study under these three headings, viz., the intellectual factor, the affective or emotional factor, and the unconscious factor. But that is not enough; the analysis should be completed by a synthesis. All imaginative creation, great or small, is organic, requires a unifying principle: there is then also a synthetic factor, which it will be necessary to determine. FOOTNOTES: [1] A. Maury, in his book _L'Astronomie et la Magie_, enumerates fifty cases. [2] There are still others, as we shall see later on. PART ONE ANALYSIS OF THE IMAGINATION CHAPTER I THE INTELLECTUAL FACTOR. I Considered under its intellectual aspect, that is, in so far as it borrows its elements from the understanding, the imagination presupposes two fundamental operations--the one, negative and preparatory, dissociation; the other, positive and constitutive, association. Dissociation is the "abstraction" of the older psychologists, who well understood its importance for the subject with which we are now concerned. Nevertheless, the term "dissociation" seems to me preferable, because it is more comprehensive. It designates a genus of which the other is a species. It is a spontaneous operation and of a more radical nature than the other. Abstraction, strictly so-called, acts only on isolated states of consciousness; dissociation acts, further, on series of states of consciousness, which it sorts out, breaks up, dissolves, and through this preparatory work makes suitable for entering into new combinations.