 | John Timbs - 1856 - 304 pagine
...velocity nearly equal to 57 miles an hour, supposing the falcon to have been unceasingly on the wing. But, as such birds never fly by night, and allowing...his flight was, perhaps, equal to 75 miles an hour. If we even restrict the migratory flight of birds to 50 miles an hour, how easily can they perform... | |
 | Robley Dunglison - 1856 - 768 pagine
...miles, making a velocity of nearly fifty-seven miles an hour, supposing the falcon to have been on the wing the whole time; but, as such birds never fly by night, if we allow the day to have been at the longest, his flight was perhaps at the rate of seventy-five... | |
 | John Timbs - 1857 - 444 pagine
...velocity nearly equal to 57 miles an hour, supposing the falcon to have been unceasingly on the wing. But, as such birds never fly by night, and allowing...day to be at the longest, his flight was, perhaps, ecjual to 75 miles an hour. If we even restrict the migratory flight of birds to 50 miles an hour,... | |
 | David Ames Wells - 1863 - 470 pagine
...velocity nearly equal to 57 miles an hour, supposing the falcon to have been unceasingly on the wing. But, as such birds never fly by night, and allowing...his flight was, perhaps, equal to 75 miles an hour. If we even restrict the migratory flight of birds to 50 miles an hour, how easily can they perform... | |
 | Mordecai Cubitt Cooke, John Eller Taylor - 1870 - 316 pagine
...velocity nearly equal to 57 miles an hour, supposing the Falcon to have been unceasingly on the wing. But as such birds never fly by night, and allowing...his flight was, perhaps, equal to 75 miles an hour. If we even restrict the migratory flights of birds to 50 miles an hour, how easily can they perform... | |
 | George Montagu - 1881 - 504 pagine
...computed to be not less than 1350 miles ; a velocity equaKo fifty-seven milesanhour,!supposing the Hawk to have been on wing the whole time. But as such birds...night, and allowing the day to be at the longest, or to be eighteen hours light, this would make seventy-five miles an hour. It is probable, however,... | |
 | 1881 - 426 pagine
...velocity nearly equal to 57 miles an hour, supposing the falcon to have been unceasingly on the wing. But as such birds never fly by night, and allowing the day to be at the longest, its flight was perhaps equal to 75 miles an hour. If we even restrict the migratory flight of birds... | |
 | 1826 - 380 pagine
...less than 1350 miles, a velocity equal to 57 miles an hour, supposing the hawk to have been on the wing the whole time ; but as such birds never fly by night, and allowing the day to be at its greatest length, or 18 hours light, this would make 75 miles an hour. It is piobable, however,... | |
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... the wing the whole time. But as such birds never fly by night, and allowing the day to be at the longest, his flight was perhaps equal to 75 miles an hour. 
