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Published online by Cambridge University Press: 31 May 2012
From the condition of an hypothesis the glacial epoch has been elevated into that of a theory by the explanations it has afforded to a certain class of geological phenomena. The present paper endeavors to show that certain zoological facts are consistent with the presence, during past times, of a vast progressive field of ice, which, in its movement from north to south, gradually extended over large portions of the North American continent. These facts, in the present instance, are furnished by a study of our Lepidoptera, or certain kinds of butterflies and moths now inhabiting the United States and adjacent territories.
* See Mr. Scudder's article in the “Geology of New Hampshire,” 1, 342. Mr. Scudder first pointed out the existence of Alpine and sub-Alpine faunal belts on Mount Washington, and interstingly remarks, “that if the summit of Mount Washington were somewhat less than two thousand feet higher, it would reach the limit of perpetual snow.”