It is agreed that the data of psychology must be behavioral rather than mental if psychology is to be a member of the United Sciences, but the position taken [by Boring and Stevens] is merely that of “methodological” behaviorism. According to this doctrine the world is divided into public and private events; and psychology, in order to meet the requirements of a science, must confine itself to the former. This was never good behaviorism, but it was an easy position to expound and defend and was often resorted to by the behaviorists themselves. It is least objectionable to the subjectivist because it permits him to retain “experience” for purposes of “non-physicalistic” self-knowledge. (p. 428)
