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possible to perform without the aid of the senses. On the other hand, Aristotle maintains that a man, when asleep, is not capable of using his senses. To this I reply by conceding that during sleep a man certainly does not perceive what is going on about him. Wherefore, if you answer me by saying that the mere fact of a man's ability to walk while he is asleep furnishes conclusive evidence that he possesses his senses, I reply that movements like that of walking are not the result of an impression made upon the mind ("impressio imaginativa"), but the product of a different mechanism, of a nature which permits it to operate during sleep As to the second point to which you call attention—that, namely, with regard to the power of bridling and riding a horse while one is asleep—I make this reply: These acts are performed as a result of an impression made upon the mind through the working of the imagination, and not as a direct consequence of any images created upon the eye; for, if the sleep-walker happens to be in a strange house when the impulse to walk seizes him, he will not go to the stable. The route which he is sure to take will be one with which he is familiar, as happened in the case of the blind teacher who, unaccompanied by any person, walked habitually through the streets of Bologna. And then, besides, I am able to speak from personal experience, for in one of my sleep walks I jumped down from an elevation about four feet above the ground without awaking from my sleep When, in the course of one of these walks, I am exposed to cold, or when I hear somebody speaking near me, I refer these phenomena entirely to something within myself, and I return to my bed.

Of the four medical schools to which a brief reference was made on a preceding page, that of Bologna was probably the first to attain a certain degree of celebrity; and it owed this distinction very largely to the work done by men who were primarily surgeons, viz.: Hugo of Lucca; Theodoric, Hugo's son; William of Saliceto; and possibly, to a very slight extent, Roland of Parma, who spent only a part of his professional life in Bologna. But there was one other who, while he was not a surgeon, yet contributed very greatly to the fame of the Bologna school and at the same time to the real advance in surgical knowledge which characterized the work of the men whose names have just been mentioned—viz., Mondino. These men, especially