"But a person who calls himself a psychologist is in a peculiar position these days. Before he can write about the psychology of emotion, or intelligence, or, in fact, about the psychology of any human behaviour, he must define what he means by psychology. The introspectionistic psychologists, now considered unscientific, regarded any exposition as psychological which described its phenomena in subjective or introspective terms. Now the introspectionists are pushed into the background. In their place we find a great variety of teachers and researchers all naming their diverse methods and observations "psychology". We have, for instance, in the field of emotions, the physiologists, the neurologists, the physiological psychologists, the behaviorists, the endocrinologists, the mental-tester-statisticians, the psycho-analysts, and the psychiatrists. Each of these types of worker confesses himself to be a psychologist, and, moreover, each maintains that his are the only psychologically worth-while results. Psychology to-day, like Europe in the Middle Ages, is being fought over by feudal barons who have little in common save tacit acceptance of the rule that spoils shall be taken whenever and however possible."