208. Processes for the formation of mediums have been sought for as people seek diagnostics ; but as yet we know of none more efficacious than those we have indicated. In the persuasion that the obstacle to the development of the faculty is an entirely material resistance, some pretend to overcome it by a kind of gymnastics almost dislocating the arm and head. We do not describe this process, which comes to us from across the Atlantic, not only because we have no proof of its efficacy, but from the conviction we have that it may be dangerous to delicate constitutions by the disturbance of the nervous system. If the rudiments of the faculty do not exist, nothing can give them, not even electricity, which has been unsuccessfully em- ployed for the same end.