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There is a fine reddish-yellow sand in the lower air-strata; we see it, we feel it, and we know that it comes from the desert-tracts of northern Africa. The air rises en masse from the Great Sahara; the vacuum is speedily filled by the heavier and cooler indraught from the north or south, and the higher strata form the upper current flowing from the Equator to the Poles.
Everybody must have been killed at once. The poison must have swept the earth clean of human life." "But how did we escape?" asked the girl. "That's hard telling. I figure it this way: The mephitic gas probably was heavy and dense, thus keeping to the lower air-strata, following them, over plain and hill and mountain, like a blanket of death. "Just what happened to us, who can tell?
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