Summary

Portrait of T. S. Stribling T. S. Stribling The Web of the Sun (Adventure Magazine… (1922)

This discovery brought back to his mind the idea that had been edging in when Birdsong's remark had interrupted. Was it possible some man had visited them during the night with a noiseless airplane? Did an unknown civilization exist in the hinterlands of the Andes that manufactured a silken cordage out of some unknown colloid?
The moment Lassiter hit on this theory, the various threads in this snarl of facts began to straighten. The killing of the mules, the selection of the spot, the light he had seen in the abyss, all became amenable to human motives.
Source: Wikisource

Portrait of T. S. Stribling T. S. Stribling The Web of the Sun (Adventure Magazine… (1922)

Balthasar nodded, strongly, “but, señor, why do you think the Jivaros are highly civilized?”
“This cordage suggests it. I never saw anything like it in the Stendill factories——”
The agent was rather pleased at the casual way in which he corroborated his own story.
“A noiseless airship would prove it; it would explain why we saw that searchlight in the abyss last night; it explains why our own lives were spared— Just think, they have flying machines which they can use indifferently as a tractor to draw a dead mule, or to sail away into the void.
Source: Wikisource

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