_We can repress to a remarkable degree the sensations of fatigue, hunger and thirst_. Truly no man can defy the laws of nature, but it is very certain that in cases like that of Dr. TANNER, and the Hindu ascetics who were boxed up and buried for many weeks, there must have been mental determination as well as physical endurance. As regards this very important subject of health, or the body, and the degree to which it can be controlled by the mind or will, it is to be observed that of late years physiologists are beginning to observe that all "mental" or corporeal functions are evidently controlled by the same laws or belong to the same organization. If "the emotions, say of anger or love, in their more emphatic forms, are plainly accompanied by varying changes of the heart and blood-vessels, the viscera and muscles," it must follow that changes or excitement in the physical organs must react on the emotions. "All modes of sensibility, whatever their origin," says LUYS, "are physiologically transported into the sensorium. From fiber to fiber, from sensitive element to sensitive element, our whole organism is sensitive; our whole sentient personality, in fact, is conducted just as it exists, into the plexuses of the _sensorium commune_." Therefore, if every sensation in the body acts on the brain by the aid of secondary brains or ganglions, it must be that the brain in turn can in some way act on the body. And this has hitherto been achieved or attempted by magicians, "miracle-mongers," thaumaturgists, mesmerists, and the like, and by the modern hypnotizer, in which we may observe that there has been at every step less and less mysticism or supernaturalism, and a far easier process or way of working. And I believe it may be fairly admitted that in this work I have simplified the process of physically influencing mental action and rendered it easier. The result from the above conclusions being that _we can control many disorders or forms of disease_. This is an immense subject, and it would be impossible within a brief sketch to determine its limits or conditions. That what are called nervous disorders, which are evidently the most nearly allied to emotions--as, for instance, a headache, or other trouble induced by grief--can be removed by joy, or some counteracting emotion or mere faith is very well known and generally believed. But of late science has established that the affinities between the cerebral and other functions are so intimately, extensively and strangely sympathetic or identical that it is becoming impossible to say what disease may not be temporarily alleviated or cured by new discoveries in directing the nervo-mental power or will. The Faith-Cure, Magic, Mesmerism, Religious Thaumaturgy and other systems have given us a vast number of authentic cures of very positive disorders. But from the point of view taken by many people what has been wanting in all is, _firstly_, a clear and simple scientific method free from all