"I have this power in perfection, but I notice that I lose it if I depend on any one calling me. In this latter case my mind does not take the trouble of reasoning the time or of listening to the clock. But in the former it is necessary that it do so, otherwise the phenomenon is inexplicable. Every one has made or can make this experiment." M. Jouffroy is doubtless mistaken in supposing that the mind is necessarily employed in watching the clock; for the experiment is just as successful in the absence of any timepiece. Besides, the fact that animals possess the faculty shows that it is an inherent attribute of the subjective mind. It is the lapse of time that is noted by men as well as by animals, and is wholly independent of artificial methods or instruments for marking the divisions of time. Every one possesses this faculty in a greater or less degree, and the subject need not, therefore, be enlarged upon. As before intimated, hypnotic subjects possess in a very remarkable degree the faculty of noting the lapse of time. On this subject Professor Bernheim[10] says:-- "If a somnambulist is made to promise during his sleep that he will come back on such and such a day, at such and such an hour, he will almost surely return on the day and at the hour, although he has no remembrance of his promise when he wakes up. I made A say that he would come back to me in thirteen days, at ten o'clock in the morning. He remembered nothing when he waked. On the thirteenth day, at ten o'clock in the morning, he appeared, having come three kilometres from his house to the hospital. He had been working in the foundries all night, went to bed at six in the morning, and woke up at nine with the idea that he had to come to the hospital to see me. He told me that he had had no such idea on the preceding days, and did not know that he had to come to see me. It came into his head just at the time when he ought to carry it out." It is also well known to all hypnotists that subjects in a hypnotic sleep will awaken at any hour prescribed to them by the operator, seldom varying more than five minutes from the time set, even when the sleep is prolonged for hours. If the subject is commanded to sleep, say, ten or fifteen minutes, he will generally awaken exactly on time. This fact also is universally recognized by those familiar with hypnotic phenomena, and the subject need not be further illustrated.