The brain is the point of contact between spirit and matter, and as far as the manifestations of that spirit are related to the material world while connected with the physical body, it must be through and by means of the brain. The intimate character of this relation gives strong color to the reasoning based on the material view that the brain produces thought, as the liver produces bile. But such reasoning is from appearance rather than the reality. There is, as Tyndall eloquently expresses, a chasm between matter and mind that can not be passed. “The passage from the physics of the brain to the corresponding facts of consciousness is unthinkable.... Were our minds and senses so expanded, strengthened, and illuminated, as to enable us to see and feel the very molecules of the brain; were we capable of following all their motions, all their groupings, all their electric discharges, if such there be; and were we intimately acquainted with the corresponding states of thought and feeling,--we should be as far as ever from the solution of the problem, ‘How are these physical processes connected with the facts of consciousness?’ The chasm between the two classes of phenomena would still be intellectually impossible.” SPIRITUAL SUBSTANCE.--As the experiments alluded to show that matter may, under certain conditions, take on new properties, ceasing to be matter, in the usual acceptance of that word, the horizon of matter which has been thought to rest over attenuated hydrogen, may extend to infinite reaches beyond, including stuffs or substances which have never been revealed to the senses. As the eye is capable of detecting only a narrow belt of rays, and the ear a scarcely broader belt of sounds, beyond which, on either side, are unknown realms of light and sounds, so we are able to detect only a narrow range of elements; and there may be a realm on one side too gross for recognizance by the senses, and on the other, one too attenuated. Beings fashioned of this attenuated substance might walk by our side unseen, nor cast a shadow in the noon-day sun. SPIRIT ETHER.--Aside from this spiritual substance, beyond the pale of the most attenuated matter, is the spirit ether. The students of light have found it possible to explain its phenomena only by the hypothesis of an ether, a universal fluid of extreme tenuity, the vibrations of which are interpreted by the eye as light. This ether was at first a dream of the imagination; but, by answering all questions and receiving the verification of mathematics, it has become a demonstrated reality. It is probably the common medium for the transference of electricity, heat, and magnetism as well. It is an illustration of one of the many instances where the Imagination has overreached the Reason in the race of discovery.