“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 he was all beard and hat-rim. “No doubt, sir, a limited knowledge would have that effect. When one’s knowledge is exhaustive, one comes to other conclusions.” They glared at each other in mutual defiance, while all round rose the distant whisper, “We will kill you⁠—we will kill you if we can.”