. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). 26 SEXUAL SELECTION. [Part II. fact the vocal organs of the males are more highly de- veloped than those of the females. In some genera the males alone are provided with sacs which open into the For instance, in the edible frog (Rana esculen^ to) " the sacs are peculiar to the males, and become, when filled with air in the act of croaking, large globular blad-. Please note that these images are extracted from scan
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). 26 SEXUAL SELECTION. [Part II. fact the vocal organs of the males are more highly de- veloped than those of the females. In some genera the males alone are provided with sacs which open into the For instance, in the edible frog (Rana esculen^ to) " the sacs are peculiar to the males, and become, when filled with air in the act of croaking, large globular blad-. 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 : D. Appleton and Co.
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Keywords: ., boo, bookcentury1800, bookdecade1870, booksubjectnaturalselection
