the tube from the third to the fourth cylinder. Now it was clear that this also was nearly exhausted. That horrible feeling of constriction was closing in upon me. I ran across and, unscrewing the nozzle, I changed it to our last supply. Even as I did so my conscience pricked me, for I felt that perhaps if I had held my hand all of them might have passed in their sleep. The thought was banished, however, by the voice of the lady from the inner room, crying:—
"George, George, I am stifling!"
"It is all right, Mrs. Challenger," I answered, as the others started to their feet. "I have just turned on a fresh supply."
Even at such a moment I could not help smiling at Challenger, who with a great hairy fist in each eye was like a huge, bearded baby, new wakened out of sleep. Summerlee was shivering like a man with the ague, human fears, as he realized his position, rising for an instant
