Subconscious perceptions even more than absent-minded acts offer some of the most interesting phenomena of conservation, for these phenomena give evidence of the ability, under certain conditions, to reproduce, in one mode or another, experiences which were never a phase of the personal consciousness, never entered even the fringe of the content of this consciousness and of which, therefore, we were never aware. For this reason they are not, properly speaking, forgotten experiences. Their reproduction sometimes produces dramatic effects. The following is an instance: B. C. A., waking one night out of a sound sleep, saw a vision of a young girl dressed in white, standing at the foot of her bed. The vision was extraordinarily vivid, the face so distinct that she was able to give a detailed description of it. She had no recollection of having seen the face before, and it awakened no sense of familiarity. Suspecting, for certain reasons, the figure to be that of a young girl who had recently died and whom I knew that B. C. A. had never known and was not aware that she had ever seen, I placed before her a collection of a dozen or more photographs of different people among which was one of this girl. This photograph she picked out as the one which most resembled the vision (it was a poor likeness) and automatic writing confirmed most positively the choice. Now it transpired that she had passed by this girl on one occasion while the latter was talking to me in the hall of my house, but she had purposely, for certain reasons, not looked at her. Subconsciously, however, she had seen her since she could give, both in hypnosis and by automatic writing, an accurate account of the incident, which I also remembered. B. C. A., however, had no recollection of it. The subconscious perception was later reproduced (after having undergone secondary elaboration) as a vision. Similarly I have known paragraphs read in the newspapers out of the corner of her eye, so to speak, and probably by casual glances, not only, as I have said, to be recalled in hypnosis and by automatic writing, but to be reproduced with more or less elaboration in her dreams. She had, as the evidence showed, no awareness at the time of having read these paragraphs and no after recollection of the same. Experimentally, as I have said, it is possible to demonstrate other phenomena which are the same in principle. The experiment consists, after surreptitiously placing objects under proper precautions in the peripheral field of vision, in having the subject fix his eyes on central vision and his attention distracted from the environment by intense concentration or reading. Immediately after removing the objects it is determined that the subject did not consciously perceive them. But in hypnosis or by other methods it is found that memory for perceptions of the peripheral objects returns, i.e., the perceptions are reproduced. Auditory stimuli may be used as tests with similar results.