The nervous system is the bridge which spans the chasm between matter and spirit, and the battle between Materialism and Spiritualism must be fought not only with brain, but in the province of brain. However we may regard the spiritual being as an independent entity, when we study this subject from the physical side, we are compelled to accept the intricate blending of the influence of the brain on the expression of that being, during its connection therewith. The issue directly stated is this: Does the brain yield mind as a result of organic changes in its cells and fibers, or is mind a manifestation through and by means of the brain of something beyond and superior? It is admitted by profound thinkers that the brain and its functions is an unfathomed mystery, and that investigators must be content with what may be called secondary causes and effects. Phosphorus and sulphur may be essential for the activity of brain tissue, yet it is absurd to claim that a super-abundance of these elements wrote an Iliad, or solved the problem of gravitation. It is not phosphorus, or carbon, or nitrogen, however vigorously oxidized, which pulsates in the emotions of friendship or love; that feels and thinks and knows; that recollects the past, anticipates the future, and reaches out in infinite aspirations for perfection. The actions of thought on the brain, the effort compelling the body to serve the bidding of the spirit, may consume this element and many others, as the movement of an engine consumes the coal and wastes the steam; but the coal and the steam are only the means whereby mind impresses itself on matter. The physicist studies the brain as one wholly unacquainted with an engine would study that machine, and mistaking it for a living being, might be supposed to do. He would observe its motion, and, weighing the coal consumed and the products of combustion, would say that they appeared in steam, which after propelling the piston was waste. The design of the engine, the effect of these combinations and this waste, this observer would claim to be the guiding intelligence. And he would further argue that so much coal in the grate, so much water in the boiler and there appears an equivalent of intelligence, and the waste may be predetermined by chemical formulæ. Until the threshold of the functional activity of the brain and the nervous system have been passed, conclusions should be modestly expressed.