. The bird, its form and function. Birds. The Skull 115 and, from their rod-like jointed character, they look ver}' much like the real gill-arches of a fish. The fourth arch vanishes. Such is the almost incredible alchemy which Nature has wrought from a plastic rod of gristle,—transforming it into beak, tongue, and ears. Few of us, when watch-. FiG. 89.—Ultimate distribution of the four embryonic gill-arches in the skull of the adult bird. The dotted portions are not developed, (.\dapted from Ne\Yton.) Compare with Figs. Ki and SS. ing the gentl^^ waving gills of a fish, have realized how much
. The bird, its form and function. Birds. The Skull 115 and, from their rod-like jointed character, they look ver}' much like the real gill-arches of a fish. The fourth arch vanishes. Such is the almost incredible alchemy which Nature has wrought from a plastic rod of gristle,—transforming it into beak, tongue, and ears. Few of us, when watch-. FiG. 89.—Ultimate distribution of the four embryonic gill-arches in the skull of the adult bird. The dotted portions are not developed, (.\dapted from Ne\Yton.) Compare with Figs. Ki and SS. ing the gentl^^ waving gills of a fish, have realized how much we indirectly owe to them. A noted German anatomist—Karl Gegenbaur—believes that we owe even our hands and arms (by way of the pectoral fins of fishes) to portions of the gill framework, but this theory is not generaUy 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 Beebe, William, 1877-1962. New York, Holt
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1906
