indentation I now searched for. Luckily I found it, less than half a mile away—an almost circular pit, perhaps five miles in diameter, with shining walls extending downwards into blackness. There seemed no possible way of descending into it, so I sat down near its edge to think out my plan of action.

"I realized now that I was faint and hungry, and whatever I did must be done quickly. I could turn back to you, or I could go on. I decided to risk the latter course, and took twelve more of the pills—three times my original dose."

The Chemist paused for a moment, but his auditors were much too intent to question him. Then he resumed in his former matter-of-fact tone.

"After my vertigo had passed somewhat—it was much more severe this time—I looked up and found my surroundings growing at a far more rapid rate than before. I staggered to the edge of the pit. It was opening up and widening out at an astounding rate. Already its sides were becoming rough and broken, and I saw many places where a descent would be possible.

"The feeling of sleep that had formerly merely oppressed me, combined now with my physical fatigue and the larger dose of the drug I had taken, became almost intolerable. I yielded to it for a moment, lying down on a crag near the edge of the pit. I must have become almost immediately unconscious, and remained so for a considerable time. I can remember a horrible sensation of sliding headlong for what seemed like hours. I felt that I was sliding or falling downward. I tried to rouse but could not. Then came absolute oblivion.

"When I recovered my senses I was lying partly covered by a mass of smooth, shining pebbles. I was bruised and battered from head to foot—in a far worse condition than you first saw me when I returned.

"I sat up and looked around. Beside me, sloped upward at an apparently increasing angle a tremendous glossy plane. This extended, as far as I could see, both to the right and left and upward into the blackness of the sky overhead. It was this plane that had evidently broken my fall, and I had been sliding down it, bringing with me a considerable mass of rocks and bowlders.

"As my senses became clearer I saw I was lying on a fairly level floor. I could see perhaps two miles in each direction. Beyond that there was only darkness. The sky overhead was unbroken by stars or light of any kind. I should have been in total darkness except, as I have told you before, that everything, even the 

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