It is said that most mischievous consequences have resulted from the doings of some practitioners--and it must be so, if the means be granted; and it is admitted not to be a very rare gift. The last mesmeric exhibition I witnessed, was at Dr Elliotson's. It appeared to be of so public a nature, that I presume there is no breach of confidence in describing what took place. There were three persons mesmerised, all from the lower rank of life. The first was put into the sleep by, I think, but two passes of the hand, (Lord Morpeth the performer.) She was in an easy-chair: all her limbs were rendered rigid--and, as I was quite close to her, I can testify that she remained above two hours in one position, without moving hand or foot, and breathing deeply, as in a profound sleep. Her eyes were closed, and she was finally wakened by Dr Elliotson waving his hand at some distance from her. As he motioned his hand, I saw her eyelids quiver, and at last she awoke, but could not move until the rigidity of her limbs was removed by having the hand slightly passed over them. She then arose, and walked away, as if unconscious of the state she had been in. The two others were as easily transferred to a mesmeric state. They conversed, answered questions, showed the usual phrenological phenomena, singing, imitating, &c. But there was one very curious phrenological experiment which deserves particular notice. They sat close together. Dr W. E---- touched the organ of Acquisitiveness of the one, (we will call her A.) She immediately put out her hand, as if to grasp something, and at length caught hold of the finger of Dr W. E----; she took off his ring and put it in her pocket. Dr W. E---- then touched the organ of Justice of the second girl, (B,) and told her that A had stolen his ring. B, or Justice, began to lecture upon the wickedness of stealing. A denied she had done any such thing, upon which Dr W. E---- remarked, that thieving and lying always went together. Then, still keeping his hand on Acquisitiveness, he touched also that of Pride; then, as Justice continued her lecture, the thief haughtily justified the act, that she should steal if she pleased. The mesmeriser then touched also the organ of Combativeness, so that three organs were in play. Justice still continued her lecture; upon which A, the thief, told her to hold her tongue, and not lecture her, and gave her several pretty hard slaps with her hand. Dr W. E---- then removed his hands, and transferred the operation, making Justice the thief, and the thief Justice; when a similar scene took place.