A third voice was indubitably that of a mechanical utterance-machine connected with one of the detached brains in the cylinders. There was as little doubt about that as about the buzzings; for the loud, metallic, lifeless voice of the previous evening, with its inflectionless, expressionless scraping and rattling, and its impersonal precision and deliberation, had been utterly unforgettable. For a time I did not pause to question whether the intelligence behind the scraping was the identical one which had formerly talked to me; but shortly afterward I reflected that any brain would emit vocal sounds of the same quality if linked to the same mechanical speech-producer; the only possible differences being in language, rhythm, speed, and pronunciation. To complete the eldritch colloquy there were two actually human voices—one the crude speech of an unknown and evidently rustic man, and the other the suave Bostonian tones of my erstwhile guide Noyes.