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Rh of Malaya. It is decreed by a merciful Nature that the human brain cannot think of two things simultaneously, so that if it be steeped in curiosity as to science it has no room for merely personal considerations. All day amid that incessant and mysterious menace our two Professors watched every bird upon the wing, and every shrub upon the bank, with many a sharp wordy contention, when the snarl of Summerlee came quick upon the deep growl of Challenger, but with no more sense of danger and no more reference to drum-beating Indians than if they were seated together in the smoking-room of the Royal Society's Club in St. James's Street. Once only did they condescend to discuss them.

"Miranha or Amajuaca cannibals," said Challenger, jerking his thumb towards the reverberating wood.

"No doubt, sir," Summerlee answered. "Like all such tribes, I shall expect to find them of polysynthetic speech and of Mongolian type."

"Polysynthetic certainly," said Challenger, indulgently. "I am not aware that any other type of language exists in this continent, and I have notes of more than a hundred. The Mongolian theory I regard with deep suspicion."

"I should have thought that even a limited knowledge of comparative anatomy would have helped to verify it," said Summerlee, bitterly.

Challenger thrust out his aggressive chin until