. Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics. Animal locomotion; Aeronautics. ^5 Fig. e X Fig. 93. Fig. 92.—Right wing of Beetle {GoUatJius rnicans). dorsal surface. This wing somewhat resembles the kestrel's (fig. 61, p. 186) in shape. It has an ante- rior thick margin, d e /, and a posterior thin one, b a c. Strong nervures run along the anterior margin (r^), until they reach the joint (e). where the wing folds upon itself during repose. Here the nervures split up and di- varicate and gradually become smaller and smaller until they reach the
. Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics. Animal locomotion; Aeronautics. ^5 Fig. e X Fig. 93. Fig. 92.—Right wing of Beetle {GoUatJius rnicans). dorsal surface. This wing somewhat resembles the kestrel's (fig. 61, p. 186) in shape. It has an ante- rior thick margin, d e /, and a posterior thin one, b a c. Strong nervures run along the anterior margin (r^), until they reach the joint (e). where the wing folds upon itself during repose. Here the nervures split up and di- varicate and gradually become smaller and smaller until they reach the ex- tremity of the wing (/) and the posterior or thin margin (5); other ner- vures radiate in graceful curves from the root of the wing. These also become finer as they reach the posterior or thin margin (c ci). r, Root of the wing with its complex compound joint. The wing of the beetle bears a certain analogy to that of the bat, the nervures running along the anterior margin {d) of the wing, resembling the humerus and forearm of the bat (fig. 94, c?, p. 1T5), the joint of the beetle's wing (e) corresponding to the carpal or wrist-joint of the bafs wing (fisr. 94, e), the terminal or distal nervures of the beetle (/ b) to the phalanges of the bat (fig. 94, / b). The parts marked fb may in both instances be Hkened to the primary feathers of the bird, that marked a to the secondary feathers, and c to the tertiary feathers. In the wings of the beetle and bat no air can possibly escape through them during the return or up stroke.—Original. Fig. 93,—Right vnng of the Beetle {Goliathus micanfi). as seen from behind and from beneath. When so viewed, the anterior or thick margin {d f) and the posterior or thin margin (b x c) are arranged in different planes, and form a true helix or screw. Compare with figs. 95 and 91 .—Original. side can likewise be made to move independently of those of the opposite side, so that the centre of gravity, which, in insects, bats, and birds, is
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectaeronau, bookyear1874
