One of the most striking of these instances we may here append. A student relates that a professor had said to his class in mathematics, of which this student was a member, "'A question of great difficulty has been referred to me by a banker, a very complicated question of accounts, which they themselves have not been able to bring to a satisfactory issue, and they have asked my assistance. I have been trying, and I cannot resolve it. I have covered whole sheets of paper with calculations and have not been able to make it out. Will you try?' He gave it as a sort of problem to his class, and said he would be extremely obliged to any one who would bring him the solution on a certain day. This gentleman tried it over and over again. He covered many slates with figures, but could not succeed in resolving it. He was a little put on his mettle, and very much desired to attain the solution. But he went to bed on the night before the solution, if attained, was to be given in, without having succeeded. In the morning, when he went to his desk, he found the whole problem worked out in his own hand. He was perfectly sure that it was his own hand. And this was a curious part of it, that the result was attained by a process very much shorter than any he had tried. He had covered three or four sheets of paper in his attempts, and this was all worked out on one page, and correctly worked, as the result proved. He inquired of the woman who attended to his room, and she said that she was certain no one had entered it during the night. It was perfectly clear that this had been worked out by himself." Instances of this kind are certainly very curious, and seem to show that the mind, when set in any train of thought by intense concentration, may pursue it after consciousness has been withdrawn. And the result indicates that the mind acts with innate logic when not disturbed by distracting considerations, and can be trusted to do more correct work when thus set going and left to run of itself than when consciously held to its work. Yet an examination of every recorded instance of this kind strongly indicates that no such unconscious mental action ever takes place except when the consciousness has been earnestly directed to the subject in advance, that no marked instances of this activity ever occur except in the unconsciousness of sleep or trance, and that it ceases when the mental excitement that started it has gradually subsided. There is not an instance on record to show that the mind ever originates unconscious action, or that any of its remote stores or powers ever spring into activity without being aroused by sensation or conscious thought. Thus the doctrine of _unconscious cerebration_ has been carried much further than the facts warrant. It need hardly be said that it is utterly inapplicable as a theory to many of the facts adduced by the Society for Psychic Research.