Prof Johnson Exposed.Galveston, Tex., June 3.—A lively sensation was created here to*day by the exposure of Professor E. G. Johnon, who has been doing the town for over a week as a mesmerist. The exposure was ; made by two of his attaches, Narcross, of New Orleans, and A. Collier, of San Antonio. They assert that they had loarned their parts well under the tutelage of the professor, and that he refused to pay them for their services, and hence the exposure. Professor Johnson claims the matter as false, and intended to injure him In his business. A personal difficulty between Johnson and the parties named, this morning, ended in the arrest of the boys, who were fined by the Recorder for disturbing the peace, and were committed in default of bond. Johnson Is booked for other performance here. It is not known whether ho will attempt to appear before a Galveston public.The above has referenoeto the Johnson who was for some weeks with T lllotson A Fell’s combination last year.