. Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics. Animal locomotion; Aeronautics. 48 ANIMAL LOCOMOTION. extremities of the toes superiorly are armed with powerful short nails, the tips of which project inferiorly to protect the toes and confer elasticity when the foot is leaving the ground. The foot like the leg, is remarkable for its great strength. The legs of the ostrich are closely set, another feature of speed.^ The wings of the ostrich are in a very rudimentai y. Fig. 25.—Ostnehes pursued by a Hunter. condition as compared, with the legs.^ All the
. Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics. Animal locomotion; Aeronautics. 48 ANIMAL LOCOMOTION. extremities of the toes superiorly are armed with powerful short nails, the tips of which project inferiorly to protect the toes and confer elasticity when the foot is leaving the ground. The foot like the leg, is remarkable for its great strength. The legs of the ostrich are closely set, another feature of speed.^ The wings of the ostrich are in a very rudimentai y. Fig. 25.—Ostnehes pursued by a Hunter. condition as compared, with the legs.^ All the bones are pre- sent, but they are so dwarfed that they are useless as organs of flight. The angles which the bones of the wing make with each other, are still less than the angles made by the bones ot* the leg. This is just what we would a priori expect, as the velocity with which wings are moved greatly exceeds that with which legs are moved. The bones of the wing of the ostrich are inclined towards each other at nearly right angles. 1 In dranght horses the legs are much wider apart than in racers; the legs of the deer being less widely set than those of the racer. 2 In the apteryx the wings are so very small that the bird is commonl;y spoken of as the wmgless ;. 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 Pettigrew, James Bell, 1834-1908. New York, D. Appleton & company
Size: 1728px × 1445px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectaeronau, bookyear1874
