Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 119
bird (as at present constructed) destined to navigate the air,and levity to that destined to navigate the water. If a birdwas made very large and very light, it is obvious that thediving force at its disposal would be inadequate to submergeit. If, again, it was made very small and very heavy, it… … which flies in the air, and has curtailed the travelling surfacesof the former, while she has increased those of the latter. PKOGRESSION ON AND IN THE WATER. 95 For the same reason, she has furnished the diving bird witha certain degree of buoyancy, and the flying bird with a cer-tain amount of…
Animal locomotion · Aeronautics
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