It does credit to the alertness of Ammi's mind that he puzzled even at that tense moment over a point which was essentially scientific. He could not but wonder at his gleaning of the same impression from a vapour glimpsed in the daytime, against a window opening on the morning sky, and from a nocturnal exhalation seen as a phosphorescent mist against the black and blasted landscape. It wasn't right - it was against Nature - and he thought of those terrible last words of his stricken friend, "It come from some place whar things ain't as they is here... one o' them professors said so..."