sleep. His mind undoubtedly had recurred to his old teacher and the rule; and as he dreamed about the matter, the working out of the problem had to come in some form. What more natural than that the image of the teacher who taught him the greater part of what he knew of the subject of arithmetic, especially in difficult problems, should have come in to give bodily shape to the shame which he felt, and that his fancy should attribute the information to him? So that, instead of such a dream being extraordinary, it is the most natural method in which it could occur.
The mind when awake is capable, by an effort of the imagination, of conceiving most grotesque ideas. For example, a man sees before him a huge rock. He may conceive the idea that that rock is transformed into pure gold, and that upon it is a raised inscription, made of diamonds, promising the rock as a reward for the guessing of a conundrum. Being awake, he perceives both clearly—the rock in its original character, and the image of the gold rock with the raised letters in diamonds. Perceiving both, he knows the rock to be real and the other to be fantastic. If the faculties by which he identifies the granite rock were to be stupefied, leaving those by which he conceives the idea of the gold and diamonds in full exercise, it is clear that he would believe that the granite rock was gold. If awake, in this state, he would be insane; if asleep, he would be dreaming. So, if the dreamer be absorbed in images which seem to him real, if the faculties by which he would distinguish an ideal conception from an objective reality were restored, he would take cognizance of his surroundings, and though the image might remain it would not seem real. The statement of this self-evident fact is sufficient to show what all the evidence I have col-
