be quite the thing this season. I wonder what the creatures intend doing with us, Perry. They don’t seem really savage. What do you suppose they can be? You were about to tell me where we are when that great hairy frigate bore down upon us—have you really any idea at all?” 

 “Yes, David,” he replied, “I know precisely where we are. We have made a magnificent discovery, my boy! We have proved that the earth is hollow. We have passed entirely through its crust to the inner world.” 

 “Perry, you are mad!” 

 “Not at all, David. For two hundred and fifty miles our prospector bore us through the crust beneath our outer world. At that point it reached the center of gravity of the five-hundred-mile-thick crust. Up to that point we had been descending—direction is, of course, merely relative. Then at the moment that our seats revolved—the thing that made you believe that we had turned about and were speeding upward—we passed the center of gravity and, though we did not alter the direction of our progress, yet we were in reality moving upward—toward the surface of the inner world. Does not the strange fauna and flora which we have seen convince you that you are not in the world of your birth? And the horizon—could it present the strange aspects which we both noted unless we were indeed standing upon the inside surface of a sphere?” 

 “But the sun, Perry!” I urged. “How in the world can the sun shine through five hundred miles of solid crust?” 

 “It is not the sun of the outer world that we see here. It is another sun—an entirely different sun—that casts its eternal noonday effulgence upon the face of the inner world. Look at it now, David—if you can see it from the doorway of this hut—and you will see that it is still in the exact center of the heavens. We have been here for many hours—yet it is still noon. 

 “And withal it is very simple, David. The earth was once a nebulous mass. It cooled, and as it cooled it shrank. At length a thin crust of solid matter formed upon its outer surface—a sort of shell; but within it was partially molten matter and highly expanded gases. As it continued to cool, what happened? Centrifugal force hurled the particles of the nebulous center toward the crust as rapidly as they approached a solid state. You have seen the same principle practically applied in the modern cream separator. Presently there was only a small super-heated core of gaseous matter remaining within a huge vacant interior left by the contraction of the cooling gases. The equal attraction of the 

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