So the preoccupation of the psychologist with states of consciousness may signify that they are the media, the concrete conditions to which he purposely reduces his material, in order, _through them_, as methodological helps, to get at and understand that which is anything but a state of consciousness. To him, however, who insists upon the fixed and final limitation of psychology, the state of consciousness is not the shape some fact takes from the exigency of investigation; it is literally the full fact itself. It is not an intervening term; it bounds the horizon. Here, then, the issue defines itself. I conceive that states of consciousness (and I hope you will take the phrase broadly enough to cover all the specific data of psychology) have no existence before the psychologist begins to work. He brings them into existence. What we are really after is the process of experience, the way in which it arises and behaves. We want to know its course, its history, its laws. We want to know its various typical forms; how each originates; how it is related to others; the part it plays in maintaining an inclusive, expanding, connected course of experience. Our problem as psychologists is to learn its _modus operandi_, its method. The paleontologist is again summoned to our aid. In a given district he finds a great number and variety of footprints. From these he goes to work to construct the structure and the life habits of the animals that made them. The tracks exist undoubtedly; they are there; but yet he deals with them not as final existences but as signs, phenomena in the literal sense. Imagine the hearing that the critic would receive who should inform the paleontologist that he is transcending his field of scientific activity; that his concern is with footprints as such, aiming to describe each, to analyze it into its simplest forms, to compare the different kinds with one another so as to detect common elements, and finally, thereby, to discover the laws of their arrangement in space! Yet the immediate data are footprints, and footprints only. The paleontologist does in a way do all these things that our imaginary critic is urging upon him. The difference is not that he arbitrarily lugs in other data; that he invents entities and faculties that are not there. The difference is in his standpoint. His interest is in the animals, and the data are treated in whatever way seems likely to serve this interest. So with the psychologist. He is continually and perforce occupied with minute and empirical investigation of special facts--states of consciousness, if you please. But these neither define nor exhaust his scientific problem. They are his footprints, his clues through which he places before himself the life-process he is studying--with the further difference that his footprints are not after all given to him, but are developed by his investigation.[56]