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Rh One other memory remains with me of this wonderful day, and with it I will close this letter. The two professors, their tempers aggravated no doubt by their injuries, had fallen out as to whether our assailants were of the genus pterodactylus or dimorphodon, and high words had ensued. To avoid their wrangling I moved some little way apart, and was seated smoking upon the trunk of a fallen tree, when Lord John strolled over in my direction.

"I say, Malone," said he, "do you remember that place where those beasts were?"

"Very clearly."

"A sort of volcanic pit, was it not?"

"Exactly," said I.

"Did you notice the soil?"

"Rocks."

"But round the water—where the reeds were?"

"It was a bluish soil. It looked like clay."

"Exactly. A volcanic tube full of blue clay."

"What of that?" I asked.

"Oh, nothing, nothing," said he, and strolled back to where the voices of the contending men of science rose in a prolonged duet, the high, strident note of Summerlee rising and falling to the sonorous bass of Challenger. I should have thought no more of Lord John's remark were it not that once again that night I heard him mutter to himself: "Blue clay—clay in a volcanic tube!" They were the last words I heard before I dropped into an exhausted sleep.