IV. If the cold formed the ice and the ice formed the Drift, why is there no Drift in the coldest regions of the earth, where there must have been ice?
V. Continental ice-belts, reaching to 40° of latitude, would have exterminated all tropical vegetation. It was not exterminated, therefore such ice-sheets could not have existed.
VI. The Drift is found in the equatorial regions of the world. If it was produced by an ice-sheet in those regions, all pre-glacial forms of life must have perished; but they did not perish; therefore the ice-sheet could not
[1. "Popular Science Monthly," April, 1874, p. 646.]
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have covered these regions, and could not have produced the drift-deposits there found.
In brief, the Drift is not found where ice must have been, and is found where ice could not have been; the conclusion, therefore, is irresistible that the Drift is not due to ice.
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