. Darwinism : an exposition of the theory of natural selection, with some of its applications. Natural selection; Evolution. DIAGRAM OF VARIATION 55. 7 5 10 15 20 Fio. 4.—Dolichonyx oryzivorus. 20 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wallace, Alfred Russel, 1823-1913. London : Macmillan

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