He told me--or tried to tell me. I am no scientist, to put down here abstruse explanations of a subject so vastly unknown. Nor would I obtrude them into this narrative. I recall that Drake explained how by a shifting of gravitational force this vehicle could be guided for space-flight. That I understood. The bow of the ship made attractive--to receive the gravitational attraction of whatever masses of matter lay in that direction. And the stern made repellent, or neutral, at will. All that I could understand. An interplanetary flyer, of the sort which often on earth had been contemplated. The size-change principle was also comprehensible in fundamental generalities. But how, upon this inward trip, could we search these myriad molecules for one particular molecule? And then find one atom? And within that atom find one electron--or a proton, whichever it might be--within which was a vast reach of astronomical space? Drake called our guiding instrument a spectrometer--an instrument tuned to the vibrations of Dianne's world. He spoke of being able to search out the characteristic spectrum; he spoke of electronic resistance factors; of the aura of this designated world we sought, its atomic force which, as we approached it--or receding, went astray--was shown upon our instrument, thus to guide us. Let the textbooks explain it. There are many such now being published. I can record only those things I saw and did. And they, in truth, are strange enough so that I can only affirm my veracity and let it pass at that. Beyond our windows came a void of emptiness, with only occasional single molecules drifting past. They were always larger. Then I saw them as objects enormous. Great dark worlds of that unsolid stuff we call solidity! Drake insisted that I try and get some sleep. The ship was being patrolled end to end for any sign of Togaro; but there was none. Dianne urged, "You must sleep, Frank. We must all keep normal. There will be so much to do when we arrive." "Tomorrow," said Drake. Tomorrow! So incongruous a term! All normality of time or space seemed gone. But I did try to sleep, and for a while must have done so, for I dreamed a phantasmagoria of shifting things in a void of blackness. I wakened to find Drake alone at the window. "The girls are sleeping, Frank. No sign of Togaro. Sit here by me." He had an automatic in his hand. We both wore belts of the drugs--and a belt with holsters for the other weapons. "Look, Frank." We had been in the vehicle now some twelve or fifteen hours. I was astonished when Drake told me I had slept four hours at least. I saw outside the window now a scene wholly different from before. We had reached, and been maintaining now for a considerable time, our fastest rate of diminishing size-change. Much faster than near the beginning of the voyage, and conceivably faster than the most rapid rate that the drugs could give.