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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 is the truth, nay, to adopt our common language, the sole and scientific truth, verified by experience; and the universe is