 | Charles Darwin, Frederick Burkhardt - 1985 - 726 หน้า
...as regards their permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and... | |
 | Ernst Mayr - 1982 - 996 หน้า
...however, that the parallelism is not complete. Wallace states his thesis with extraordinary clarity: "There is a general principle in nature which will...departing further and further from the original type" (1858: 54). The language in which this observation is presented is rather typological; Wallace's conclusion,... | |
 | Charles Darwin - 1996 - 382 หน้า
...as regards their permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and... | |
 | Edmund Blair Bolles - 1999 - 518 หน้า
...as regards their permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there...tendency of varieties to return to the parent form. The Struggle for Existence The life of wild animals is a struggle for existence. The full exertion... | |
 | Alfred Russel Wallace - 2002 - 1002 หน้า
...as regards their permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and... | |
 | Michael Shermer - 2001 - 368 หน้า
...likely Darwin received Wallace's essay on June 18. It contained, for Darwin, an all too familiar theme that "there is a general principle in nature which...departing further and further from the original type. . . ."20 Darwin was stunned. "I never saw a more striking coincidence," he told Lyell in a letter dated... | |
 | Alfred Russel Wallace - 2002 - 460 หน้า
...regards their permanence of further variation. But this is the object of the present paper to show that this assumption is altogether false, that there...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and... | |
 | Michael Shermer - 2002 - 448 หน้า
...Darwin's eye first, but one can imagine that he must have been taken aback by Wallace's conclusion that "there is a general principle in nature which...departing further and further from the original type." Whatever it was, Darwin was stunned by what he read. He immediately put pen to paper and wrote his... | |
 | Charles Darwin - 2003 - 676 หน้า
...as regards their permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there...tendency of varieties to return to the parent form. The life of wild animals is a struggle for existence. The full exertion of all their faculties and... | |
 | Martin Fichman - 2010 - 393 หน้า
...scientific elite. THE 1858 ESSAY: BREVITY AND BRILLIANCE The object of Wallace's 1858 essay was to show "that there is a general principle in nature which...departing further and further from the original type." His argument proceeded from the premise that the "struggle for existence" among animals in the wild... | |
| |
But it is the object of the present paper to show that this assumption is altogether false, that there is a general principle in nature which will cause many varieties to survive the parent species, and to give rise to successive variations departing... 
