The theory that only a fragment of the psychic activity paralysed by sleep finds expression in dreams is that by far the most favoured by medical writers, and by scientists in general. In so far as one may presuppose a general interest in dream-interpretation, one may indeed describe it as the most popular theory of dreams. It is remarkable how nimbly this particular theory avoids the greatest danger that threatens every dream-interpretation; that is, shipwreck on one of the contrasts incorporated in dreams. Since this theory regards dreams as the result of a partial waking (or, as Herbart puts it in his Psychologie uber den Traum, "a gradual, partial, and at the same time very anomalous waking"), it is able to cover the whole series, from the inferior activities of dreams, which betray themselves by their absurdity, to fully concentrated intellectual activity, by a series of states of progressive awakening, ending in complete wakefulness.

Those who find the physiological mode of expression indispensable, or who deem it more scientific, will find this theory of dreams summarized in Binz's description (p. 43):

"This state (of torpor), however, gradually comes to an end in the hours of early morning. The accumulated products of fatigue in the albumen of the brain gradually diminish. They are slowly decomposed, or carried away by the constantly flowing blood-stream. Here and there individual groups of cells can be distinguished as being awake, while around them all is still in a state of torpidity. The isolated work of the individual groups now appears before our clouded consciousness, which is still powerless to control other parts of the brain, which govern the associations. Hence the pictures created, which for the most part correspond to the objective impressions of the immediate past, combine with one another in a wild and uncontrolled fashion. As the number of brain-cells set free constantly increases, the irrationality of the dream becomes constantly less."

The conception of the dream as an incomplete, partial waking state, or traces of the influence of this conception, will of course be found in the works of all the modern physiologists and philosophers. It is most completely represented by Maury. It often seems as though this author conceives the state of being awake or asleep as susceptible of shifting from one anatomical region to another; each anatomical region seeming to him to be connected with a definite psychic function. Here I will merely suggest that even if the theory of partial waking were confirmed, its finer superstructure would still call for exhaustive consideration.

No function of dreams, of course, can emerge from this conception of the dream-life. On the contrary, Binz, one of the chief proponents of this theory, consistently enough denies that dreams have any status or importance. He says (p. 357): "All the facts, as we see them, urge us to characterize the dream as a physical process, in all cases useless, and in many cases definitely morbid."

The expression physical in reference to dreams (the word is emphasized by the author) points, of course, in more than one direction. In the first place, it refers to the aetiology of dreams, which was of special interest to Binz, as he was studying the experimental production of dreams by the administration of drugs. It is certainly in keeping with this kind of dream-theory to ascribe the incitement to dreaming, whenever possible, exclusively to somatic origins. Presented in the most extreme form the theory is as follows: After we have put ourselves to sleep by the banishment of stimuli, there would be no need to dream, and no reason for dreaming until the morning, when the gradual awakening through the fresh invasion of stimuli might be reflected in the phenomenon of dreaming. But, as a matter of fact, it is not possible to protect our sleep from stimuli; like the germs of life of which Mephistopheles complained, stimuli come to the sleeper from all directions- from without, from within, and even from all those bodily regions which never trouble us during the waking state. Thus our sleep is disturbed; now this, now that little corner of the psyche is jogged into the waking state, and the psyche functions for a while with the awakened fraction, yet is thankful to fall asleep again. The dream is the reaction to the disturbance of sleep caused by the stimulus, but it is, when all is said, a purely superfluous reaction.

The description of the dream- which, after all, remains an activity of the psychic organ- as a physical process has yet another connotation. So to describe it is to deny that the dream has the dignity of a