apparatus.

When he had gone I plunged at once into the task of learning the control and operation of our craft. The next two hours I spent under the tutelage of Sarto Sen, and at the end of that time I had already learned the essential features of the ship's control. There was a throttle which regulated the frequency of the vibrations generated in the engine-room below, thus increasing or decreasing our speed at will, and a lever and dial which were used to project the propelling vibrations out at any angle behind us, thus controlling the direction in which we moved. The main requisite in handling the craft, I found, was a precise and steady hand on the two controls, since a mere touch on one would change our speed with lightning swiftness, while a slight movement of the other would send us millions of miles out of our course almost instantly.

At the end of two hours, however, I had attained sufficient skill to be able to hold the cruiser to her course without any large deviations or changes of speed, and Sarto Sen had confidence enough in my ability to leave me alone at the controls. He departed down the little stair behind me, to give a few minutes' inspection to the generators below, and I was left alone in the conning-tower.

Standing there in the dark little room, its only sound the deep humming of the generators below and its only lights the hooded glows which illuminated the dials and switches before me, I gazed intently through the broad fore-window, into that crowding confusion of swarming suns that lay around us, that medley of jeweled fires in which the great star Alto burned like a living flame. For a long time I gazed toward the star that was our goal, and then my thoughts were broken into by the sound of Sarto Sen reascending the stair behind me. I half turned to greet him, then turned swiftly back to the window, stiffening into sudden attention.

My eyes had caught sight of a small patch of deep blackness far ahead, an area of utter darkness which was swiftly expanding, growing, until in less than a second, it seemed, it had blotted out half the thronging stars ahead. For a moment the sudden appearance of it dumfounded me so that I stood motionless, and then my hands leaped out to the controls. I heard Sarto Sen cry out, behind me, and had a glimpse of the darkness ahead, obscuring almost all the heavens. The next moment, before my hands had more than closed upon the levers, all light in the conning-tower vanished in an instant, and we were plunged into the most utter darkness which I have ever experienced. At the same moment the familiar hum 

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