that in this example the sensitiveness of the brain during sleep was so great that audible impressions were received with vigor sufficient to awake consciousness before they were sufficiently strong to arrest the attention when actually awake. The extreme sensibility of the brain, under certain conditions, to impressions from a distance, is further illustrated by the experience of persons laboring under diseases which produce serious departures from a healthy cerebral circulation. Thus, one of my patients, while suffering with cerebral hyperæmia, could hear children talking half a mile away, at a distance where no one else could hear them. This susceptibility is doubtless the foundation of many well authenticated cases of presentiment. Another of my patients, a lady of remarkably sensitive nervous organization, though otherwise in apparently good health, was one evening lying alone upon her bed. Suddenly, she became greatly agitated with the conviction that something had happened to her husband, who had not yet returned from his place of business. He presently, however, came quietly into the house, and greeted his wife as usual. She exclaimed at once, “What has happened to you, my dear?” “Nothing,” he replied. “Yes,” she said, “something has happened, just now; I felt that you were in trouble.” “Oh, yes,” answered he, after a moment’s reflection, “as I was passing by the park, on my way home, two men tried to stop my horse, but I whipped up, and got away from them without any trouble.” On another occasion the same patient was one day suddenly oppressed by a conviction that something had happened to her mother and sister, who were driving together at some distance from home. After a short time they actually returned in a sorry plight, without their carriage. The horse had run away, upsetting them upon the road. In all these cases it is worthy of remark that there was present an unusual degree of cerebral erethism. Solicitude, weariness, anxiety, inordinate irritability of the brain. It is possible that under such conditions one may hear premonitory sounds, may in some sort feel distant agitations which our healthy organs are usually incapable of apprehending. When such a brain during sleep is unoccupied with the ordinary objects of sensation, feeble impulses, which usually remain unnoticed, may sometimes suffice to arrest the attention. We may thus explain the possibility of impressions derived from distant events passing into the consciousness of a dreamer, and arousing hallucinations of which the immediate cerebral mechanism is the same as that of the ordinary hypnagogic hallucination. Thus, the Rev. Canon Warburton relates the following experience[66]: