. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . aidby this moth, comparatively few individuals, after escapingparasitism, pass through the struggle of life and are able toperpetuate the species. Yet in spite of the hazards encounteredduring the egg, larval, and pupa stages the polyphemus is oneof our most common moths. Darwin ^ says in a letter to Mentioned by Morgan, Experimental and Letters, p. 132. 64 NATURE SKETCHES IN TEMPERATE AMERICA Lyel
. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . aidby this moth, comparatively few individuals, after escapingparasitism, pass through the struggle of life and are able toperpetuate the species. Yet in spite of the hazards encounteredduring the egg, larval, and pupa stages the polyphemus is oneof our most common moths. Darwin ^ says in a letter to Mentioned by Morgan, Experimental and Letters, p. 132. 64 NATURE SKETCHES IN TEMPERATE AMERICA Lyell, I always repeat to myself that we hardly know whyany one single species is rare or eoiniiion in the best-knowncountries. Whether a species is abundant in a given localityis necessarily determined by natural causes. Chief among theconditions favoring existence of a species are its adjustment toits surroundings, that is, maintaining itself against competi-tion with members of the same species and other enemies, andthe resistance to climatic conditions. I have attempted inthe foregoing account to exemplify by the polyphemus mothsome of its adaptations to these varied \^y ^^-f .-/^4
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