There is another large class of correspondents, which is not to be blamed, and which is one of the most interesting contributers to the psychologist's files. People write long discussions of theories which they build up on peculiar happenings in their minds. The theories themselves may be entirely illogical, or at least in contradiction to all acknowledged science, but such letters are interesting, because they disclose abnormal mental states. Here it is not real insanity; but all kinds of abnormal impulses or ideas, of psychasthenic emotions, of neurasthenic disturbances, of hysteric inhibition, are the starting points, and it is only natural that such pathological intrusions should bewilder the patient and induce him to form the wildest theories. Again, he may believe in the most improbable and most fantastic connection of things, but this is due to the overwhelming power of disturbances which he is indeed unable to explain to himself. I have a whole set of letters from women who explain in fantastic theories their magical power to foresee coming events; and yet it is not difficult to recognize as the foundation of all such ideas some well-known forms of memory disturbance. Commonly it is the widespread tendency of women to accompany a scene with the feeling that they have experienced it once before. They are few who never have had it, especially in states of fatigue; many have it very often; and some are led to trust it and to become convinced that they really experienced the scene, at least in their minds, beforehand. This uncanny impression then easily develops into untenable speculations on the borderland of normal intellect. The letters which approach those of the insane most nearly come from persons who try to work out a theory to account for hysterical experiences which break into their normal life. Sometimes the most absurd explanations must be acknowledged as justified from the standpoint of the patient. A woman wrote to me that she had the abnormal power to produce railroad wrecks by her mere will, while she was lying at home in bed. She wanted me to hypnotize her in order to relieve her from this uncanny power. She had elaborated this thought in full detail. She did not know, what I found out only slowly, that in hysterical attacks at night, for which every memory was lost the next morning, she used a stolen switch key to open a switch, because she was angry with a railway official. I will ignore all such cases with an abnormal background here and confine myself to the healthy crowd.