"Nor is there an end of mine," remarked Challenger, "for science is not dead, and this catastrophe in itself will offer us many most absorbing problems for investigation."
He had now flung open the windows and we were gazing out upon the silent and motionless landscape.
"Let me consider," he continued. "It was about three, or a little after, yesterday afternoon that the world finally entered the poison belt to the extent of being completely submerged. It is now nine o'clock. The question is, at what hour did we pass out from it?"
"The air was very bad at daybreak," said I.
"Later than that," said Mrs. Challenger. "As late as eight o'clock I distinctly felt the same choking at my throat which came at the outset."
"Then we shall say that it passed just after eight o'clock. For seventeen hours the world has been soaked in the poisonous ether. For that length of time the Great Gardener has sterilized the human mold which had grown over the surface of His fruit. Is it possible that the work is incompletely done—that others may have survived besides ourselves?"
"That's what I was wonderin'," said Lord John. "Why should we be the only pebbles on the beach?"
"It is absurd to suppose that anyone besides ourselves can possibly have survived," said Summerlee with conviction. "Consider that the poison was so virulent that even a man who is as strong as an ox and has not a nerve in his body, like Malone here, could hardly get up the stairs before he fell unconscious. Is it likely that anyone could stand seventeen minutes of it, far less hours?"
"Unless someone saw it coming and made preparation, same as old friend Challenger did."
"That, I think, is hardly probable," said Challenger, projecting his beard and sinking his eyelids. "The combination of observation, inference, and anticipatory imagination which enabled me to foresee the danger is what one can hardly expect twice in the same generation."