But, I shall be told, the wall that divides psychology from philosophy cannot be so easily treated as non-existent. Psychology is a matter of natural history, even though it may be admitted that it is the natural history of the course of experience. But philosophy is a matter of values; of the criticism and justification of certain validities. One deals, it is said, with genesis, with conditions of temporal origin and transition; the other with analysis, with eternal constitution. I shall have to repeat that just this rigid separation of genesis and analysis seems to me a survival from a pre-evolutionary, a pre-historic age. It indicates not so much an assured barrier between philosophy and psychology as the distance dividing philosophy from all science. For the lesson that mathematicians first learned, that physics and chemistry pondered over, in which the biological disciplines were finally tutored, is that sure and delicate analysis is possible only through the patient study of conditions of origin and development. The method of analysis in mathematics is the method of construction. The experimental method is the method of making, of following the history of production; the term “cause” that has (when taken as an existent entity) so hung on the heels of science as to impede its progress, has universal meaning when read as condition of appearance in a process. And, as already intimated, the conception of evolution is no more and no less the discovery of a general law of life than it is the generalization of all scientific method. Everywhere analysis that cannot proceed by examining the successive stages of its subject, from its beginning up to its culmination, that cannot control this examination by discovering the conditions under which successive stages appear, is only preliminary. It may further the invention of proper tools of inquiry, it may help define problems, it may serve to suggest valuable hypotheses. But as science it breathes an air already tainted. There is no way to sort out the results flowing from the subject-matter itself from those introduced by the assumptions and presumptions of our own reflection. Not so with natural history when it is worthy of its name. Here the analysis is the unfolding of the existence itself. Its distinctions are not pigeon-holes of our convenience; they are stakes that mark the parting of the ways in the process itself. Its classifications are not a grasp at factors resisting further analysis; they are the patient tracings of the paths pursued. Nothing is more out of date than to suppose that interest in genesis is interest in reducing higher forms to cruder ones: it is interest in locating the exact and objective conditions under which a given fact appears, and in relation to which accordingly it has its meaning. Nothing is more naïve than to suppose that in pursuing “natural history” (term of scorn in which yet resides the dignity of the world-drama) we simply learn