167     When I here speak of the decided and certain curative power of positive mesmerism, I most assuredly do not mean that abuse of it, where, by repeated passes of this kind, continued for half an hour or a whole hour at a time, and, even day after day, performed on weak, nervous patients, that monstrous revolution of the whole human system is effected which is termed somnambulism, wherein the human being is ravished from the world of sense and seems to belong more to the world of spirits—a highly unnatural and dangerous state, by means of which it has not infrequently been attempted to cure chronic diseases.