If the temporary diversion of the nervous energy from the brain have this effect, what must a permanent diversion accomplish? It will accomplish precisely what is indicated by the look and language of our two young friends at the station-house. It will develop muscle for the uses of a special calling, and make ugly and clumsy men of those who should be symmetrical; and at the same time it will repress mental development, and permanently limit mental growth--at least, so long as the mind shall be associated with the body. I suppose that every fecundated germ of human being is endowed with a certain possibility of development--a complement of vital energy which will be expended in various directions, according to the circumstances which may surround it and the will of its possessor. If it shall be mainly expended upon the growth and sustentation of muscle, it will not be expended upon the growth and sustentation of mind; and I have no hesitation in saying that it is an absolute impossibility for a man who engages in hard bodily labor every day to be brilliant in intellectual manifestation. The tide of such a man's life does not set in that direction. An hourglass has in it a definite quantity of sand; and when I turn it over, that sand falls from the upper apartment into the lower; and while it occupies that position it will continue to fall until the former is exhausted and the latter is filled. Moreover, it will never take its place at the other end of the instrument, until it is turned back. It is precisely thus with a human constitution. The grand vital current moves only in one direction, and when it is moving toward muscle it is not moving toward mind, and when it is moving toward mind it is not moving toward muscle. This fact is illustrated sufficiently by the phenomena of digestion. After a man has eaten a hearty dinner, he becomes dull, even to drowsiness or perfect sleep. Why? Simply because the tide of nervous energy sets towards digestion, and there is not enough left to carry on mental or voluntary muscular operations.