 | 1859 - 578 lehte
...assumption is altogether false, that there is a general principle in nature which will cause many varietiet to survive the parent species, and to give rise to...which also produces, in domesticated animals, the tendeney of varieties to return to the parent form. The life of wild animals is a struggle for existence.... | |
 | Alfred Russel Wallace - 1871 - 412 lehte
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...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... | |
 | 1871 - 588 lehte
...regards their permanence or further variation," states that the object of this paper is to prove " that this assumption is altogether false, that there...tendency of varieties to return to the parent form." Here we clearly have the idea of the formation of species by the method of natural selection, and the... | |
 | 1871 - 578 lehte
...regards their permanence or further variation," states that the object of this paper is to prove " that this assumption is altogether false, that there...tendency of varieties to return to the parent form." Here we clearly have the idea of the formation of species by the method of natural selection, and the... | |
 | Alfred Russel Wallace - 1891 - 518 lehte
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...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 lehte
...overcome by assuming that such varieties have strict limits, and can never again vary further from the original type, although they may return to it, which,...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 lehte
...not certainly proved. It will be observed that this argument rests entirely on the assumption, lhat varieties occurring in a state of nature are in all...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 lehte
...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 lehte
...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 lehte
...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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... even identical with those of domestic animals, and are governed by the same laws 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 is a general... 
