 The force to keep up the momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted. The movement of the neck and body of the condor, we must suppose, is sufficient...  The Illustrated Natural History: Birds - Page 15by John George Wood - 1862 - 2396 pagesFull view - About this book
 | Railway readings - 1847 - 172 pages
...The propelling force in their motion is greatly derived from the head and neck. It is truly wonderful to see so great a bird, hour after hour, without any...exertion, wheeling and gliding over mountain and river. (Darwin^ South America.) Poison of Vipers.—Mr. Humboldt has observed, that in the recent experiments... | |
 | Philip Henry Gosse - 1849 - 344 pages
...this force is all that is wanted. The movement of the neck and body of the Condor, we must suppose, is sufficient for this. However this may be, it is truly...exertion, wheeling and gliding over mountain and river." Mr. Darwin supposes that the Condor breeds only once in two years, that it lays two large white eggs... | |
 | William Dowling - 1849 - 356 pages
...if the extended wings formed the fulcrum on which the movements of the neck, body, and tail acted. It is truly wonderful and beautiful to see so great...exertion, wheeling and gliding over mountain and river." It is only recently that the true history of the condor has become known, many wild tales having been... | |
 | Aeronautical Society of Great Britain - Aeronautics - 1883 - 488 pages
...this force is all that is wanted. The movement of the neck and body of the condor, we must suppose, is sufficient for this. However this may be, it is truly...exertion, wheeling and gliding over mountain and river." So far as the soaring birds are concerned the case might rest here. Observe that the strongest and... | |
 | Indians of South America - 1875 - 232 pages
...the fulcrum on which the movements of the neck, body, and tail, acted. . . . It is truly wonderful to see so great a bird, hour after hour, without any...exertion, wheeling and gliding over mountain and river.' ' Some old writers have affirmed,' says Tschudi, ' that the plumage of this bird is invulnerable to... | |
 | Charles Darwin - Beagle Expedition - 1876 - 586 pages
...this force is all that is wanted. The movement of the neck and body of the condor, we must suppose, is sufficient for this. However this may be, it is truly...wonderful and beautiful to see so great a bird, hour afker hour, without any apparent exertion, wheeling and gliding over mountain and river. April 29t!t.... | |
 | Charles Darwin - Beagle Expedition - 1879 - 452 pages
...the rapid descent seemed to urge the bird upward with the even and steady movement of a paper kite. It is truly wonderful and beautiful to see so great...wheeling and gliding over mountain and river. THE OSTRICH. ON the fine plains of turf in Banda Oriental we saw many ostriches (Struthio rli,ea). Some... | |
| |
