Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 122
ame time, proceeding from without in-wards and from below upwards during flexion, or when it isfolded up, as happens during the back stroke. In the acts ofextension and flexion the legs are slightly rotated, and the PROGRESSION ON AND IN THE WATER. 97 feet more or less tilted. The same movements… … Fig. 49.—Foot of Grebe (Podiceps). In this foot each toe is provided with itsswimming membrane ; the membrane being closed wlien tiie foot is flexed,and expanded when the foot is extended. Compare with foot of swan (fig.48), where the swimming membrane is continued from the one toe to…
Animal locomotion · Aeronautics
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