The infantile form of the wish-dream, alike in adults and children, is thus, there can be little doubt, extremely common, and, even in its symbolic forms, it is a real and not rare phenomenon. But it is impossible to follow Freud when he declares that all dreams fall into the group of wish-dreams. The world of psychic life during sleep is, like the waking world, rich and varied; it cannot be covered by a single formula. Freud's subtle and searching analytic genius has greatly contributed to enlarge our knowledge of this world of sleep. We may recognise the value of his contribution to the psychology of dreams while refusing to accept a premature and narrow generalisation. The wish-dream of the kind elaborately investigated by Freud may be accepted as one type of dreaming, and a very interesting type, but it seems evident that it is only one type. There are even other types which seem closely related to it, and yet are quite distinct. This is, for instance, the case with the contrast-dream. The contrast-dream of Näcke's type represents the emergence of characteristics which are distinctly opposed to the dreamer's character and habits. Thus, in the course of four consecutive nights, I have dreamed in much detail that (1) I was the mayor of a large northern city about to take the chair at a local meeting of the Bible Society; (2) that I was a soldier in the heat of battle; and (3) that I was meditating the step of going on the stage as a comedian--the only rôle of the three which seemed to cause me any nervousness or misgiving. In contrast-dreams of this type we are not concerned with the eruption of concealed and repressed wishes. They are merely based on vestigial possibilities, entirely alien to our temperament as it has developed in life, and only a part of our complex personalities in the sense that, as Schopenhauer said, whatever path we take in life there are latent germs within us which could only have developed in an exactly opposite path. Even the very same dream may be due to quite different causes. To take a very simple dream, for we may best argue on the simplest facts: the dream of eating. We dream of eating when we are hungry, but sometimes we also dream of eating when the stomach is suffering from repletion. The dream is the same, but the psychological mechanism is entirely different, in the one case emotional, in the other intellectual. In the first case the picture of eating is built up in response to an organic visceral craving, and we have an elementary wish-dream of what Freud would call infantile type; in the second case the same dream is a theory, embodied in a concrete picture, to account for the existence of the repletion experienced.