As there are many millions of sensitive persons who are capable of receiving these impressions from the brain, we cannot but wonder at the unanimous _indifference_ (which some may hereafter call stupidity) which hinders the medical profession and scientists generally from becoming acquainted with such facts, which I have proclaimed and demonstrated until I have grown weary of attempting to instruct wilful ignorance. Not only does the nervaura, direct from the brain convey such impressions of organic action, but almost any substance held for a few moments in contact with any part of the head will absorb enough of the local nervaura to convey a distinct impression to a sensitive, similar to that derived directly from the head. Although the organs of the brain are thus distinct, they are not distinct like the spokes of a wheel, each totally independent of the other and fixed or invariable in its own simple character; for all organs have double functions, and a great variety in their degree of manifestation. The double function is psychic and physiological, or physical. When the action of the brain is confined within the cranium, its action is purely psychic; but when its influence passes into the body, it produces physiological effects. As the brain is the seat of the soul, its action is essentially and primarily psychic; but as it is the commander of the body, and the source of its spiritual vitality, all its conditions or actions affect the body; and hence every organ has its dual action, psychic and physiological. Cerebral physiology and sarcognomy explain in detail how the brain and the mental conditions affect the body; cerebral psychology shows how the brain and soul are correlated. The purpose of this treatise is to show how the brain is correlated with both soul and body, giving the principal attention to the former. If cerebral organs all have this double function, it is manifestly exceedingly difficult, if not impossible, to find any words competent to express the double functions, and it will be necessary to adapt our nomenclature to expressing the psychic function, leaving the physiological to be expressed otherwise. As the basilar organs act more directly upon the body, their nomenclature will be more suggestive of physiological effects. The organ, for example, of alimentiveness or appetite will suggest by its name its relation to the stomach.