Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York, D. Appleton & company · leaf 229
hat apparent buoyancy i^birds which we so highly esteem, arising not from superior-lightness, but from their possessing that degree of soliditywhich enables them to subjugate the air,—weight and inde-pendent motion, i.e. motion associated with animal life, orwhat is equivalent thereto, being the… … PROGRESSION IN OR THROUGH THE AIR. 205 which enables them to act through its instrumentality withmarvellous dexterity and power, and to expend or reservetheir energies, which they can do with the utmost exactitude,in their apparently interminable flights. Lifting-capacity of Birds,—The muscular…
Animal locomotion · Aeronautics
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