. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. 430 THE DESCENT OF MAN. The diversity of tlie sounds, both vocal and instmmental, made by the males of many birds during the breeding-. 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 Darwin, Charles, 1809-1882. New York : A. L. Burt

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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear