He never saw me, never heard me of that I am certain. Everything seemed too late for Marsten. I saw him lean forward, drop off the ledge. My words followed him crazily down as he fell: "_The displacement factor_--" Maybe before he struck the concrete down there he realized that he had been right, that the experiment had not failed. I hope so. But I think, in view of his tragic death, that Professor Marsten deserves this explanation, this proof that his work was not in vain. And because of what his hypothesis may mean to scientists of the future. It isn't conclusive enough for the strictly disciplined scientific method. But though others may think his experiment inconclusive, I _know_ that Professor Marsten proved the existence of Mental Telepathy. So I'm going to take up where Marsten ended his experiment--and his life--and I'm going to do it even though it may mean the end of my career in orthodox science. And maybe if I keep working at it, and thinking about it long enough and steadily enough, Marsten will receive my thought. Then, wherever he is now, if he doesn't already know, maybe I'll be able to tell him that he didn't fail....