Dangers have seemed to threaten the doctrine of personal immortality from the standpoint of the physiologist and the evolutionist; but these dangers have not proved fatal. The physiologist has demonstrated the close connection between the brain and the soul. It was an easy, though improper, conclusion to assert that "the brain secretes thought as the liver secretes bile." But the psychologist speedily pointed out that the physiologist had gone beyond his province. He had proved only that thought is a function of the brain. Functions may be productive or transmissive. Light as a function of the electric circuit represents a _productive_ function; music as a function of the organ illustrates a _transmissive_ function. The music is not _in_ the organ but in the organist. The organ transmits it. So, the brain is but the organ of the soul. The evolutionist has made men think in immensities and has given prime importance to the idea of development. But a creature like man who is alleged to be the product of ages of development is surely not going to be extinguished at the tomb. Darwin himself wrote: "It is an intolerable thought that men and all other sentient beings are doomed to complete annihilation after such long-continued slow progress." What candles, then, does Science light up for us? 1.--The conservation of energy and the indestructibility of matter imply that the natural forces of the world are not annihilated, however much they may be transformed. May we not hope that the peculiar form of force known as personality, the highest force in the world, will not be destroyed by the experience of death? 2.--Unfit organisms perish; fit survive. Many beliefs which once formed part of the spiritual life of man have perished in the lapse of time, but no belief has shown greater vitality and power to resist the disintegrating influences of changing environment than belief in the soul's immortality. If this belief has survived when quickened by the most awful imaginable strain of the Great War may we not conclude that it is one of those beliefs fit to live, one of those beliefs which the Creator desires to live and grow? 3.--Whenever we find a faculty, we discover in environment something to which this faculty corresponds. Progress is possible only by the constant adaptation of faculty to environment. This is true of the animal world. Is it not also true of man? In man are found faculties peculiar to himself. There is a longing for immortality, an expanding conviction of it. Does this internal condition correspond to reality? Yes, else delusion falls on man alone. For, as a distinguished scientist (Sir J. Burdon Sanderson) has said, "there is no known instance of the development of a capacity without the existence of a corresponding satisfaction."