. A manual of zoology. Zoology. Fig. 583. Fig. 584. Fig. 583.—Feather tracts and apteria o£ pigeon, dorsal view (from Ludwig- Leunis). Fig. 584.—Regions and feathers of Falcc lanarius (from Schmarda). As, sec- ondaries; Ba, belly; Br, breast; B=, rump; D'-D", wing coverts; Di, gonys of bill; EF, alula; F, culmen of bill; H, occiput; HS, primaries; K, throat;i, legs; N, neck; Sck, crown; 5F, parapterium;5(, forehead, lower tail coverts; 5z, rectrices; W, cheek; WH, cere with nostril; Zh, toes. save for the 'pith,' a small amount of dried tissue. In young growing feathers it is occupied by
. A manual of zoology. Zoology. Fig. 583. Fig. 584. Fig. 583.—Feather tracts and apteria o£ pigeon, dorsal view (from Ludwig- Leunis). Fig. 584.—Regions and feathers of Falcc lanarius (from Schmarda). As, sec- ondaries; Ba, belly; Br, breast; B=, rump; D'-D", wing coverts; Di, gonys of bill; EF, alula; F, culmen of bill; H, occiput; HS, primaries; K, throat;i, legs; N, neck; Sck, crown; 5F, parapterium;5(, forehead, lower tail coverts; 5z, rectrices; W, cheek; WH, cere with nostril; Zh, toes. save for the 'pith,' a small amount of dried tissue. In young growing feathers it is occupied by a richly vascular feather papilla, an outgrowth of the corium for purposes of nourishment. The feather may therefore be regarded as a cornified outgrowth from the skin which has arisen on a papilla of the corium, a view which accords with its development and shows its homology with the scales. In many birds (cassowaries) two well- developed feathers arise from the same follicle—a fact which explains the. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
