Such being the _Physiology and Psychology of Dream_—that is to say, the conditions of the bodily and mental mechanism under which the phenomena of Dream are presented—let us observe those phenomena and from the facts noted endeavour to learn what light is thrown by them upon Psychology. A mental state so strange and abnormal cannot fail to assist in the solution of that great problem of the Mechanism of Man which it is the vocation of Psychology to solve. Is that Mechanism moved or directed by any but a self-generated force? Is it compounded of any but the tangible material structure? Does Soul exist and, if it exists, what is its relationship to the body? A Dream is not a confused crowd of disconnected ideas. It is a succession of associated incidents more or less orderly, even when incongruous, improbable or even impossible. The mind of the sleeper constructs a drama, often having many parts played by many persons; but always himself is one of the actors. As _suggestion_ is the process by which the mind works in waking life—one idea suggesting another with which it had been at some past time associated and then another linked with that, and so forth—so does the unsleeping mind of the sleeper present to the Conscious Self a succession of suggested pictures which other mental faculties weave into a story that is enacted before himself with all its scenery and machinery! And this drama is not performed in dumb show or in pantomime merely, but it is a drama spoken as well as acted by the players, men, women, or animal, who appear to the dreamer to play before him and with him their several parts as perfectly as they would have been enacted in actual life. Hence we learn that in dream, as in the waking state, the mind acts in obedience to the laws of mind. The various mental functions are not exercised vaguely, but in more or less of orderly relationship to one another. Thus, imagination presents pictures which are accepted as having been brought from without by the senses and therefore to the sleeper are as real as if they had been objects of sight. These ideal pictures, thus received as real, according to their various characteristics excite precisely the same emotions as they would have excited had they been real. But although the picture is imaginary, the emotion is actual. We do not merely dream that we are angry or fearful; we feel actual anger and real fear. The reader may remember that often the emotion excited by the dream has continued to be felt after waking and when the dream itself has vanished. Indeed we know not how much the mental character of the day is influenced by the passions and emotions that have been stimulated by the dreams of the night, the mental excitement continuing after the cause of it has vanished and is forgotten.