ABSTRACT
AN ingenious effort is made to put the blackness-sensation into the same category with those visual sensations which are the response to the action of light on the retina. Without entering into the merits of the several hypotheses of this kind, I feel it proper to remark that the purpose for which they are set up is not one which the nature of the phenomena calls for. I do not regard it as a defect, but as a merit, of my theory of blackness that it does not explain that sensation “in terms of processes of the same general nature as those assumed to explain the other visual sensations since the sensation of blackness is the psychic correlate of a very different physical situation, namely that of no stimulus whatever—a situation which does not vary in intensity.
