It is difficult to see, however, how such a standpoint could prove useful in the practical study of logic. Certainly little headway could be made toward a study of the proper use and limitations of the categories by an investigation of the human nervous system. And to what extent would physiology illuminate the problem of the relation of the generic ideas to their appropriate objects? Although Dewey decides that the relationship must have its ground in the motor activities of the organism, his conclusion has little empirical evidence to support it. A practical, workable conception of the relations between generic ideas and their objects must be based on considerations less obscure. Why not be content to verify, by criticism, the truth that experience and thoughts about experience develop together, with the result that each theory, hypothesis, or method is applicable within the sphere where it was born? Why wait upon psychology for confirmation of a truth so obvious and important? Bosanquet remarks: "Either one may speak as if reality were relative to the individual mind, a ridiculous idea ..., or one may become interested in tracing the germination and growth of ideas in the individual mind as typical facts indeed, but only as one animal's habits are typical of those of others, and we may slur over the primary basis of logic, which is its relation to reality. For mental facts unrelated to reality are no knowledge, and therefore have no place in logic."[210] Bosanquet emphasizes an important truth neglected by Dewey. Logic is not concerned with ideas as things existing in individuals, nor with conceptions as individual modes of response. Truth has little to do with the individual as such, though the individual might well concern himself about truth. Truth is objective, super-individual, and logic is the study of the objective verity of thought. The proposition, 'All life is from the living,' finds no premises in the nerve tissues of the scientist who accepts it. How does the proposition square up with reality or experience? That is the question, and it can only be answered by turning away from psychology to empirical verification, involving a critical test of the applicability of the thought to reality.