. 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. s: i P CD . AIb gristly structure (rep- resenting the modi- olus and its lamina), which proceeds from the bony bar or bridge between fenestra ova- lis and fenestra ro-
. 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. s: i P CD . AIb gristly structure (rep- resenting the modi- olus and its lamina), which proceeds from the bony bar or bridge between fenestra ova- lis and fenestra ro- tunda. (See figs. 84, 85.) This structure is the most intimate and essential part of the organ of hearing, for upon it spread the terminal filaments of the auditory nerve. A human or any well-developed mam- malian cochlea is a thing of marvellous beauty, even as to its bony shellâthere is nothing to com- pare with its exqui- site symmetry; while the spiral radiation of the nervous tissue introduces yet other and more wondrous ;_, "curves of ; ;^ The ws<i6M?e hard- \1 ly requires special de- ^ scription; it is simply ^ the central chamber y common to the coch- '"' lear and canaUoular cavities ; receiving the mouth of the scala vestibuli of the cochlea; the several mouths of the separate or uniting semicircular canals; opening into tympanum by fenestra ova- lis; conducting to meatus auditorius internus by the course of the auditory nerve. In the eagle, if its irregularities Of contour were smoothed out, it would about hold a pea. In the language of human anatomy, the three semicircular canals are the (o) anterior or superior vertical, the (&) posterior or inferior vertical, and the (c) external or horizontal; and the planes of their respective loops are approximately mutually perpendicular, in the three &a ^ § g "w - cr ? a 5 £â a 2 g »-) 5 " § .^ S-tt g g: 5-=⢠- 000 B - ^ E^ 5 <Q. B â J B TO Ml s-Bg- <»
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
