It is a well-known fact that one of the principles of analytic psychology is that the dream images are to be understood symbolically; that is to say, that they are not to be taken literally just as they are presented in sleep, but that behind them a hidden meaning has to be surmised. It is this ancient idea of a dream symbolism which has challenged not only criticism, but, in addition to that, the strongest opposition. That dreams may be full of import, and, therefore, something to be interpreted, is certainly neither a strange nor an extraordinary idea. This has been familiar to mankind for thousands of years, and, therefore, seems much like a banal truth. The dream interpretations of the Egyptians and Chaldeans, and the story of Joseph who interpreted Pharaoh’s dreams, are known to every one, and the dream book of Artemidorus is also familiar. From countless inscribed monuments of all times and peoples we learn of foreboding dreams, of significant, of prophetic and also of curative dreams which the Deity sent to the sick, sleeping in the temple. We know the dream of the mother of Augustus, who dreamt she was to be with child by the Deity transformed into a snake. We will not heap up references and examples to bear witness to the existence of a belief in the symbolism of dreams. When an idea is so old, and is so generally believed, it is probably true in some way, and, indeed, as is mostly the case, _is not literally true, but is true psychologically_. In this distinction lies the reason why the old fogies of science have from time to time thrown away an inherited piece of ancient truth; because it was not literal but psychologic truth. For such discrimination this type of person has at no time had any comprehension. From our experience, it is hardly conceivable that a God existing outside of ourselves causes dreams, or that the dream, eo ipso, foresees the future prophetically. When we translate this into the psychologic, however, then the ancient theories sound much more reconcilable, namely, _the dream arises from a part of the mind unknown to us, but none the less important, and is concerned with the desires for the approaching day_. This psychologic formula derived from the ancient superstitious conception of dreams, is, so to speak, exactly identified with the Freudian psychology, which assumes a rising wish from the unconscious to be the source of the dream. As the old belief teaches, the Deity or the Demon speaks in symbolic speech to the sleeper, and the dream interpreter has the riddle to solve. In modern speech we say this means that the dream is a _series of images, which are apparently contradictory and nonsensical, but arise in reality from psychologic material which yields a clear meaning_.