"You have known me, Haberden, for many years as a scientific man; you and I have often talked of our profession together, and discussed the hopeless gulf that opens before the feet of those who think to attain to truth by any means whatsoever, except the beaten way of experiment and observation, in the sphere of material things. I remember the scorn with which you have spoken to me of men of science who have dabbled a little in the unseen, and have timidly hinted that perhaps the senses are not, after all, the eternal, impenetrable bounds of all knowledge, the everlasting walls beyond which no human being has ever passed. We have laughed together heartily, and I think justly, at the "occult" follies of the day, disguised under various names,--the mesmerisms, spiritualisms, materializations, theosophies, all the rabble rant of imposture, with their machinery of poor tricks and feeble conjuring, the true back-parlor magic of shabby London streets. Yet, in spite of what I have said, I must confess to you that I am no materialist, taking the word of course in its usual signification. It is now many years since I have convinced myself, convinced myself a sceptic remember, that the old iron-bound theory is utterly and entirely false. Perhaps this confession will not wound you so sharply as it would have done twenty years ago; for I think you cannot have failed to notice that for some time hypotheses have been advanced by men of pure science which are nothing less than transcendental, and I suspect that most modern chemists and biologists of repute would not hesitate to subscribe the _dictum_ of the old Schoolman, _Omnia exeunt in mysterium_, which means, I take it, that every branch of human knowledge if traced up to its source and final principles vanishes into mystery. I need not trouble you now with a detailed account of the painful steps which led me to my conclusions; a few simple experiments suggested a doubt as to my then standpoint, and a train of thought that rose from circumstances comparatively trifling brought me far. My old conception of the universe has been swept away, and I stand in a world that seems as strange and awful to me as the endless waves of the ocean seen for the first time, shining, from a Peak in Darien. Now I know that the walls of sense that seemed so impenetrable, that seemed to loom up above the heavens and to be founded below the depths, and to shut us in forevermore, are no such everlasting impassable barriers as we fancied, but thinnest and most airy veils that melt away before the seeker, and dissolve as the early mist of the morning about the brooks. I know that you never adopted the extreme materialistic position: you did not go about trying to prove a universal negative, for your logical sense withheld you from that crowning absurdity; yet I am sure that you will find all that I am saying strange and repellent to your habits of thought. Yet, Haberden, what I tell you