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 in 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 . . . . . ”