As against the introspectionist, then, the behaviorist is justified in his contention that psychological procedure must be objective and experimental in character. The danger to which he has exposed himself is the failure to differentiate his problem from that of physiology and physics. It is only by a proper recognition of both the objective and the distinctive character of conscious behavior that psychology can free itself of the reproach which is heaped upon it by members of its own household and take the place that rightfully belongs to it in the community of the sciences. IV According to the preceding exposition, the current psychological doctrine of focus and margin is an attempt to reduce the changes in the stimulus to terms of static entities denominated sensations and images. By abstracting from change we convert the new stimulus that is already on the way into inert sensory material, which lends itself to purely analytic treatment. In this way the suggested hardness of the rock becomes a "centrally aroused sensation" of a stubbed toe, the heat of the candle becomes an image of a burn, etc. As was said before, the sensations are not existences, but representatives or symbols of our nascent activities; they are the static equivalents of this foreshadowing or reference to the future. The explanation of experience that we find in James and Bergson approximates this view so closely in one respect and departs from it so widely in another as to warrant a brief discussion.