I am as convinced of continued existence, on the other side of death, as I am of existence here. It may be said, you cannot be as sure as you are of sensory experience. I say I can. A physicist is never limited to direct sensory impressions, he has to deal with a multitude of conceptions and things for which he has no physical organ: the dynamical theory of heat, for instance, and of gases, the theories of electricity, of magnetism, of chemical affinity, of cohesion, aye and his apprehension of the Ether itself, lead him into regions where sight and hearing and touch are impotent as direct witnesses, where they are no longer efficient guides. In such regions everything has to be interpreted in terms of the insensible, the apparently unsubstantial, and in a definite sense the imaginary. Yet these regions of knowledge are as clear and vivid to him as are any of those encountered in everyday occupations; indeed most commonplace phenomena themselves require interpretation in terms of ideas more subtle,--the apparent solidity of matter itself demands explanation,--and the underlying non-material entities of a physicist's conception become gradually as real and substantial as anything he knows. As Lord Kelvin used to say, when in a paradoxical mood, we really know more about electricity than we know about matter. That being so, I shall go further and say that I am reasonably convinced of the existence of grades of being, not only lower in the scale than man but higher also, grades of every order of magnitude from zero to infinity. And I know by experience that among these beings are some who care for and help and guide humanity, not disdaining to enter even into what must seem petty details, if by so doing they can assist souls striving on their upward course. And further it is my faith--however humbly it may be held--that among these lofty beings, highest of those who concern themselves directly with this earth of all the myriads of worlds in infinite space, is One on whom the right instinct of Christianity has always lavished heartfelt reverence and devotion. Those who think that the day of that Messiah is over are strangely mistaken: it has hardly begun. In individual souls Christianity has flourished and borne fruit, but for the ills of the world itself it is an almost untried panacea. It will be strange if this ghastly war fosters and simplifies and improves a knowledge of Christ, and aids a perception of the ineffable beauty of his life and teaching: yet stranger things have happened; and, whatever the Churches may do, I believe that the call of Christ himself will be heard and attended to, by a large part of humanity in the near future, as never yet it has been heard or attended to on earth.