We have been informed, by a certain mesmerizer, that a distinguished lecturer upon magnetism frequently trains persons to enact certain parts in his public exhibitions. He first puts them under mesmeric influence, and while in that state they are instructed to say certain things, or to perform certain acts, which he wishes to exhibit at some subsequent lecture. To this they severally agree, and thus a regular programme, or series of performances, is made out. They are then brought out of the mesmeric state, having been previously willed by the operator to forget all that has passed while in that state. At the next meeting appointed, these persons are present, and are again put into the same state as before, when they immediately perceive, and are ready to perform, the several parts assigned to them. In fact, they are so completely under the will and control of the lecturer, that they must do or say what he wills them to do or say, and they cannot help it, neither can they have the least recollection of what has transpired, after being restored to the normal state.