. Zoology. Zoology. 200 ZOOLOGY. part of tlie thorax, and liciice when the outstretched wings act upon the aii- as a fnlci'um all the weight of tlie body is ])laced below this surface of suspension (Marey). The flight of birds has been studied by Marey, who states that "from the manner iu which the feathers of its wing lie npon each other, it is evident that the resistance of the air. Fig. 242.—Skeleton and outline of the Dove, c, cervical vertebra?: d, dorsal vertebra?; /, lumbar vertebrte; (j\ coccyx; h. breast-bone, sternum; I, ribs; k, slioulder l)laile, scapula; I, coracoid; V, Avish
. Zoology. Zoology. 200 ZOOLOGY. part of tlie thorax, and liciice when the outstretched wings act upon the aii- as a fnlci'um all the weight of tlie body is ])laced below this surface of suspension (Marey). The flight of birds has been studied by Marey, who states that "from the manner iu which the feathers of its wing lie npon each other, it is evident that the resistance of the air. Fig. 242.—Skeleton and outline of the Dove, c, cervical vertebra?: d, dorsal vertebra?; /, lumbar vertebrte; (j\ coccyx; h. breast-bone, sternum; I, ribs; k, slioulder l)laile, scapula; I, coracoid; V, Avish-boue, clavicles; m, humerus; n, ulna; n', radius; p, car-pus; r, metaca,ipals and three digits; s, ischiatic bone; w, pelvis; t^ ilium; v, femur; ;r, tibia; a', metatarsus; 6, digits. After Liitken. can only act from below upwards, for iu the opjiosite direc- tion tlie air would force for itself an easy passage by bend- ing the long barbs of the feathers, wliich would no longer sustain each ; The wing acts on the air like a wedge or an inclined jihine, " in order to jirodnce a reaction against this resistance which impels the body of the bird upward and ;. 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 Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1897
