It was mid-afternoon. Brett, thoroughly rested, was wholly himself again. Quiet, composed and smiling, but very determined; even a little grim. And I think he was a bit ashamed of the sudden, almost querulous way in which he had terminated his narrative and left us there in the observation room at dawn. He had had his sleep now; and had been alone for an hour with his father. Martt and Frannie had been called to them; I--an outsider--was not asked, or wanted. What took place there behind the closed door of the study, it was not for me to ask. But when they came out I knew that Brett had won. A questionable victory, for old Dr. Gryce was visibly broken; Frannie--pale and upon the verge of tears; and Martt for a time a trifle sullen; resentful that he was to be left behind. I think it hurt Brett--this fear he was bringing upon those he loved. But he was very determined; convinced that it was the right thing for him to do. "I start back tonight, Frank," he told me soberly as he emerged from the study. "Oh," I said. "For how long will you be gone this time?" He hesitated. A look, which even now my memory fails to interpret, came to him. Then he smiled. "I don't know. But remember, Frank, I can return--with only those limitations the Almighty enforces--I can return to any point of earth-Time I wish. As you will live it--well, I shall aim to return here within a month." It was then I asked him about the return voyage he and Martt had just made. "Brett, I've been wondering--did our aural ray guide you back?" "Yes," he said. "On the voyage back, the first thing I did was to put the vehicle back through Time to a chosen instant at which I wished to arrive here on earth. When that was done, I held that instant always. We could not see the aural ray going out--when we looked back for it--for two reasons. One: Our Time had run far into earth's Future, and the ray was non-existent. The other: Even had we taken the proper Time-point, we were outrunning the light-rays themselves. In space, I mean, the aural ray left earth only with the speed of light. Our velocity exceeded that. You see? But on the return voyage we encountered the ray as we came in. A mere flash over the sky; but its characteristic color-bands guided us." What he said about outrunning the light-rays made me think of the myrdoscope, the image of that girl--which they had received here on earth before the voyage--that image had crossed a space 5,000,000 light-years in extent. But when I mentioned it, he explained: "The myrdal rays are not light, Frank, but only akin to it. Their velocity--why, light beside them is a laggard. We have no way of computing the velocity of the myrdal rays. But over a finite distance such as five million light-years--for practical purposes it is instantaneous. . .