Another rule reads as follows (p. 35): “If an organic apparatus is in a state of activity, excitation, or disturbance during sleep, the dream will bring ideas which are related to the exercise of the organic function which is performed by that apparatus.” Mourly Vold[73] has undertaken to prove experimentally the influence assumed by the theory of bodily sensation for a single territory. He has made experiments in altering the positions of the sleeper’s limbs, and has compared the resulting dream with his alterations. As a result he reports the following theories:— 1. The position of a limb in a dream corresponds approximately to that of reality, _i.e._ we dream of a static condition of the limb which corresponds to the real condition. 2. When one dreams of a moving limb it always happens that one of the positions occurring in the execution of this movement corresponds to the real position. 3. The position of one’s own limb may be attributed in the dream to another person. 4. One may dream further that the movement in question is impeded. 5. The limb in any particular position may appear in the dream as an animal or monster, in which case a certain analogy between the two is established. 6. The position of a limb may incite in the dream ideas which bear some relation or other to this limb. Thus, _e.g._, if we are employed with the fingers we dream of numerals. Such results would lead me to conclude that even the theory of bodily sensation cannot fully extinguish the apparent freedom in the determination of the dream picture to be awakened.[I] IV. _Psychic Exciting Sources._—In treating the relations of the dream to the waking life and the origin of the dream material, we learned that the earliest as well as the latest investigators agreed that men dream of what they are doing in the day-time, and of what they are interested in during the waking state. This interest continuing from waking life into sleep, besides being a psychic tie joining the dream to life, also furnishes us a dream source not to be under-estimated, which, taken with those stimuli which become interesting and active during sleep, suffices to explain the origin of all dream pictures. But we have also heard the opposite of the above assertion, viz. that the dream takes the sleeper away from the interests of the day, and that in most cases we do not dream of things that have occupied our attention during the day until after they have lost for the waking life the stimulus of actuality. Hence in the analysis of the dream life we are reminded at every step that it is inadmissible to frame general rules without making provision for qualifications expressed by such terms as “frequently,” “as a rule,” “in most cases,” and without preparing for the validity of the exceptions.