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. ”
