Zöology; a textbook for colleges and universities . From Thompsons Zoology FIG. 150. Wing of a dove, showing the bones and important feathers : h, humerus;r, radius; u, ulna; c, carpals; , carpo-metacarpals; , secondary feathers;, primary feathers. 373 374 ZOOLOGY Feathers modern birds are without teeth, very ancient fossilforms are known in which the jaws have numerous. From Owens Comparative Anatomy FIG. 151. Young blackbirds, showing the developing feather tracts. sharp teeth like those of a reptile. The wings are ofcourse modified anterior limbs, as may be seen by com-paring th
Zöology; a textbook for colleges and universities . From Thompsons Zoology FIG. 150. Wing of a dove, showing the bones and important feathers : h, humerus;r, radius; u, ulna; c, carpals; , carpo-metacarpals; , secondary feathers;, primary feathers. 373 374 ZOOLOGY Feathers modern birds are without teeth, very ancient fossilforms are known in which the jaws have numerous. From Owens Comparative Anatomy FIG. 151. Young blackbirds, showing the developing feather tracts. sharp teeth like those of a reptile. The wings are ofcourse modified anterior limbs, as may be seen by com-paring the bones with those of other animals. Thusthe beautiful idealistic paintings of angels, in whichthese beings are represented with human arms andhands, and in addition birdlike wings, are contrary tothe teachings of anatomy. The anatomist prefers thewinged sandals of Mercury, which do not offend againsthis science. 2. Feathers are not scattered over the bird at C. W. Beebe figures the sprouting feathers of a12-day embryo chick, and it can be seen that they arearranged in rows crossing each other X-wise, just as thescales of a fish. In the penguins, probably the mostprimitive of living birds, the feathers grow on all partsof the body, but in other birds they occupy definiteareas. These feather tracts can be observed when thebird is plucked and the points of attachmen
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
