. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds. Birds; Birds. 202 GENERAL ORNITHOLOGY. partly over each other on alternate sides is something like that upon which a, cooper fastens the ends of any one barrel-hoop without any nail
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds. Birds; Birds. 202 GENERAL ORNITHOLOGY. partly over each other on alternate sides is something like that upon which a, cooper fastens the ends of any one barrel-hoop without any nailing or tying. Tlio rings are in some bu'ds perfectly cartilaginous: in most they become osseous. The trachea is iuovchI by lateral muscles, which not only shorten the tube by the riugs, but also drag the whole structure liuckward, by their atcach- niont to the clavicle and sternum. The strip, or two strips, of muscle lying upon each side of the trachea, is the contractor trachea (fig. 101, 1, ss, ss); the most anterior, when there Fig 97. — 1, 2, rate, as in fig. 96, left hand, two tracheal rings, sepa- b; 1, 2, right hand, the same put together, as in flg. 96, a. (After Macgillivray.) are two, as soon as it leaves tlie tube to go to the clavicle, becomes the cleido-trachealis, or cleido-hyoid, fig. 101, >, /, /; the other is similarly the sterno-trachealis. The latter may be a direct continuation of the contractor, as in fig. 101, i, the loose strips under q, or apparently arise separately from the side of the lower end of the tube, as in flg. 101,16^ g. (Other muscles are to be described with the larynx superior and inferior.) The trachea is long in birds, pro- portionate to the extension of the neck; it is very flexuous, following with ease the bends nf the neck in which it lies so loosely. Its cross section is oval or circular; but all that relates to the configuration and course of the pipe requires special description, —so variable is the organ in di
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
