a determination; a dream may, for example, be continued on successive nights. On the whole, then, _dream-experience is less disorderly than is usually supposed_. Our statements must be guarded: we cannot say that the perceptive attitudes are never disturbed; we know that personality may be greatly modified; we know that scene may follow scene in the most bizarre way. The whole trend of popular psychology, however, is to emphasize the differences between dreaming and waking, while the trend of accurate observation is to bring them together. The _dream-incidents_ are derived, in the lighter stages of of sleep, mainly from the incidents of the preceding day, and in the deeper stages mainly from the remoter experience of the waking life. This is what we should expect from our knowledge of the temporal course of associative tendencies. Moreover, we know that, in profound sleep, the brain is comparatively bloodless; and it is reasonable to suppose that, in dreaming, the activity of the tendencies is local and sporadic. That would account for the _incongruities_ that our waking judgement discovers in the dream-situations, and also for the general _ineffectiveness_ of dream-thought. When, however, we enquire further into the nervous mechanism of dreaming, we must enter the realm of hypothesis. _It is a real puzzle_, for instance, _that we do not oftener walk and talk in our sleep_; for dream-ideas are vivid, and the vivid ideas of the waking life are ordinarily followed or accompanied by action. We may guess that there is a positive blocking of the nerve-paths that lead from sensory to motor centres in the brain, or from the motor centres to the muscles; else the dream would surely be talked or acted out; but we can say nothing definite about this motor inhibition. The organism at large seems to be under a ‘negative suggestion’ in regard to movement; for the pattern of action—though, like all the mental patterns, it may appear in the dream-state—is notably less frequent than the patterns of perception and idea and emotion.