. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 54 SEXUAL SELECTION: BIRDS. [Part II. wliich reminds \is of the air-sacs on each side of the mouth of certain male frogs, for he found that the sound was much diminished when one of tlie sacs of a tame bird was pricked, and wlien both were pricked it was. 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
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 54 SEXUAL SELECTION: BIRDS. [Part II. wliich reminds \is of the air-sacs on each side of the mouth of certain male frogs, for he found that the sound was much diminished when one of tlie sacs of a tame bird was pricked, and wlien both were pricked it was. 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 company
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Keywords: ., bookcentury1800, bookdecade1870, booksubj, booksubjecthumanbeings
