Let us examine for a moment the obsessions as one of the most important problems with which abnormal psychology has to deal, and which offer themselves as exaggerated examples of ideas with insistent meanings. The phenomena are psychological and physical. They occur in a sporadic form, as well as in a recurring obsessional form. Let us consider them simply as phenomena irrespective of recurrence. They may be arranged by gradations in types in which they appear: A, as purely physical disturbances; B, as physical disturbances plus conscious emotion; C, as physical disturbances plus conscious emotion plus a specific idea of the object of the emotion, but _without_ logical meaning; D, as physical disturbances plus emotion plus idea plus meaning. In the first type the physical phenomena (such as commonly attend emotion) can be traced to a functioning subconscious emotional complex of which the phenomena are physical manifestations; in the second to a functioning subconscious complex ejecting its emotion into consciousness. In the third we find by analysis an associated unconscious complex (setting), which logically would account for the emotion of the obsessing idea, and infer, by analogy with A and B, that it is a dynamic factor in the psychosis. In the fourth we find a similar complex, which logically would account for all the physical and conscious phenomena. _Type A_: The following observation may be cited as an example. At the conclusion of some experiments, made on one subject in the presence of another patient and while conversing socially at afternoon tea, I noticed that the subject manifested marked tremor of the hands to such an extent that the cup in her hand shook and rattled in its saucer. She herself commented on the fact, and laughingly remarked that she did not know what was the matter with her; at times she would “get awfully hot all over and would break out in perspiration.” She could give no explanation of this phenomenon which had not been present before the experiments were begun. The subject was now put into deep hypnosis, in a state in which communication was obtained only by writing, and thereby the subconscious tapped. Without going into all the details, the sum and substance of the information obtained in this hypnotic state was this: coconscious images (pictures), of which she was not consciously aware, kept coming and going; these were the coconscious phenomena I have previously described (p. 169). When certain images appeared coconsciously the tremor developed, and when others appeared the tremor ceased; when still others appeared there were vasomotor disturbances and perspiration as well as tremor.