 | 1859 - 578 หน้า
...as regards thcir permanence or further variation. But it is the object of the present paper to show that this assumption is altogether false, that there...general principle in nature which will cause many varietiet to survive the parent species, and to give rise to successive variations departing further... | |
 | Alfred Russel Wallace - 1870 - 414 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. Tlie Struggle for Existence. The life of wild animals is a struggle for existence. The full exertion... | |
 | Alfred Russel Wallace - 1871 - 412 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 - 1871 - 434 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...produces, in domesticated animals, the tendency of Tarieties to return to the parent form. The Struggle for Existence. The life of wild animals is a struggle... | |
 | Alfred Russel Wallace - 1891 - 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... | |
 | 1902 - 584 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... | |
 | 1858 - 478 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... | |
 | Henry Fairfield Osborn - 1924 - 290 หน้า
...notes. This is repeatedly implied in Wallace's language and especially in his sketch of 1858: . . . there is a general principle in nature which will...tendency of varieties to return to the parent form. . . . Most or perhaps all the variations from the typical form of a species must have some definite... | |
 | Henry Fairfield Osborn - 1928 - 358 หน้า
...notes. This is implied repeatedly in Wallace's language and especially in his sketch of 1858: . . . there is a general principle in nature which will...tendency of varieties to return to the parent form. . . . Most or perhaps all the variations from the typical form of a species must have some definite... | |
 | C. Leon Harris - 1981 - 360 หน้า
...analogy of the domesticated animals, is considered to be highly probable, if not certainly proved. and to give rise to successive variations departing...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... | |
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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... 
