. 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. Fig. 103. — Uro-genital organs of male embryo bird; from Owen, after Miiller. a, kidneys: 6, ureters; c, wolffian bodies; d, tlieir ducts, to be sperm-ducts; Fig. 104.
. 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. Fig. 103. — Uro-genital organs of male embryo bird; from Owen, after Miiller. a, kidneys: 6, ureters; c, wolffian bodies; d, tlieir ducts, to be sperm-ducts; Fig. 104. — Uro-genltal organs of fern ale embryo bird; from Owen, 1^ .J i, ,1 1 .. n .1 after Miiller. a, kidneys; 6, wolf- and' the relations of the a^n bodies; c, genital glaid, to mature sexual organs to the wolflSan become ovary; d, adrenals; e,ure- , -_ -- -i , 1 J. . J i J. ters; f, wolffian ducts, to disap- e, genital glands, to become bodies IS necessary to any understanding pear; 9, mullerian ducts, to become testicles; /, adrenals. Qf ^jjg parts and processes concerned in oviducts, reproduction.! We have here to consider the permanent as distinguished from the transitory kidneys, and may then recur to the subject of generation. 1 The matter may be further illustrated by the two figures borrowed ft-om Owen (after Miiller). In both figs , the large dark masses, a, are the permanent kidneys, whose ducts, 6 in fig. 103, e in fig. 104, are the ureters, empty- ing into the cloaca. In fig. 103, male, c is the wolffian body, whose duct, d, persists as the sperm-duct, conveying. 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 Coues, Elliott, 1842-1899. Boston, Estes and Lauriat
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
