TRANSITION FROM THE SIMPLE TO THE COMPLEX EMOTIONS. _The complex emotions are derived from the simple (1) by way of complete evolution; in a homogeneous form: Examples—In a heterogeneous form: Examples—(2) by arrest of development—(3) by composition; two forms—Composition by mixture; with convergent elements; with divergent elements—Composition by combination (sublimity, humour)—Modesty—Is it an instinct?—Hypotheses as to its origin._ Having studied in succession each of the tendencies which we look upon as incapable of further analysis, together with the simple emotion which expresses each, we now pass to the composite emotions. There is no need to point out that a simple emotion (fear, anger, etc.) is, in itself, a very complex phenomenon, and that “simple” means irreducible by analysis to any other emotion. All those which do not present this characteristic are complex. The problem to be stated, then, is this: How have the secondary and derivative emotions arisen from the primary or principal ones? Since it is admitted that these are typical emotions, and, on the other hand, the observation of human life shows us numerous emotional states, with their individual varieties and gradations, their transformations in the course of ages, how has this multiplicity been produced? It is under this form that the masters of the seventeenth century had stated the question, and I take it up again, because this method seems to me far superior to that of classifications, which has since become prevalent. We know that Descartes admitted only six primary passions: admiration, love, hatred, desire, joy, and sadness. “All the others,” he says, “are composed of some out of these six, or else they are different species of the same, and derived from them;”[163] and he goes on to describe about forty. Spinoza admits only three principal: desire, joy, and sadness, whence he deduces the others, which, after eliminating some repetitions, amount to forty-six. However, it is not very clearly shown by what method these philosophers determine their primary passions; it seems as though the criterion were their extremely general character, except in the case of admiration. As for the other passions, they are _deduced_, and in order to show this clearly, Spinoza always takes care in his definitions to connect the primary with the derived passion. Thus: “Fear is an ill-assured sadness, arising from the idea of some past or future thing of which we are in some doubt as to the result.” In short, their method is geometrical and deductive, especially in the _Ethics_; but we can, with slight modifications, adapt it to the exigencies of experimental psychology. Thus we have determined the primary emotions by derivation, from the chronological order of their appearance, not by their extremely general character. As for the derivative emotions, we are about to