Undoubtedly we are between two fires. In placing upon psychology the responsibility of discovering the method of experience, as a sequence of acts and passions, do we not destroy just that limitation to concrete detail which now constitutes it a science? Will not the psychologist be the first to repudiate this attempt to mix him up in matters philosophical? We need only to keep in mind the specific facts involved in the term Course or Process of Experience to avoid this danger. The immediate preoccupation of the psychologist is with very definite and empirical facts--questions like the limits of audition, of the origin of pitch, of the structure and conditions of the musical scale, etc. Just so the immediate affair of the geologist is with particular rock-structures, of the botanist with particular plants, and so on. But through the collection, description, location, classification of rocks the geologist is led to the splendid story of world-forming. The limited, fixed, and separate piece of work is dissolved away in the fluent and dynamic drama of the earth. So, the plant leads with inevitableness to the whole process of life and its evolution. In form, the botanist still studies the genus, the species, the plant--hardly, indeed, that; rather the special parts, the structural elements, of the plant. In reality, he studies life itself; the structures are the indications, the signature through which he renders transparent the mystery of life growing in the changing world. It was doubtless necessary for the botanist to go through the Linnean period--the period of engagement with rigid detail and fixed classifications; of tearing apart and piecing together; of throwing all emphasis upon peculiarities of number, size, and appearance of matured structure; of regarding change, growth, and function as external, more or less interesting, attachments to form. Examination of this period is instructive; there is much in contemporary investigation and discussion that is almost unpleasantly reminiscent in its suggestiveness. The psychologist should profit by the intervening history of science. The conception of evolution is not so much an additional law as it is a face-about. The fixed structure, the separate form, the isolated element, is henceforth at best a mere stepping-stone to knowledge of process, and when not at its best, marks the end of comprehension, and betokens failure to grasp the problem.