→ the changed conditions of 1859 1860 1861 1866 |
OMIT 1869 1872 |
|
→ there are at least 1859 1860 1861 1866 |
species present 1869 1872 |
|
→ have admitted the existence of varieties, which they have considered 1861 1866 |
have admitted the existence of varieties, which they think 1859 1860 |
admit that varieties exist, which are considered 1869 |
admit that natural varieties exist, which are considered 1872 |
|
↑ 1 blocks not present in 1859 1860 1861; present in 1866 1869 1872 |
On separate continents, and on different parts of the same continent when divided by barriers of any kind, and on outlying islands,
what a multitude
of forms exist, which some experienced naturalists rank as varieties,
others as geographical races or sub-species, and others as distinct, though closely allied species!
|
|
→ we have variability as well as a powerful agent always ready to act, 1861 |
we have under nature variability and a powerful agent always ready to act and select, 1859 1860 |
animals and plants do vary, let it be ever so slowly or so little, 1866 |
animals and plants do vary, let it be ever so little or so slowly, 1869 |
animals and plants do vary, let it be ever so slightly or slowly, 1872 |
|
→ we doubt that variations 1859 1860 1861 1866 |
we doubt that the variations or individual differences, which are 1869 |
not variations or individual differences, which are 1872 |
|
→ useful to beings, under their excessively complex relations of life, would 1859 1860 1861 |
useful to them under their extremely complex relations of life would 1866 |
beneficial would 1869 |
beneficial, 1872 |
|
→ be preserved, accumulated, and inherited? 1859 1860 1861 |
occasionally occur, and then be preserved and accumulated by natural selection? 1866 |
be preserved and accumulated through natural selection, or the survival of the fittest? 1869 1872 |
|
→ himself, should nature fail in selecting variations useful, 1859 1860 1861 |
himself, should nature fail in preserving or selecting variations useful, 1866 |
him, why, 1869 1872 |
|
→ conditions 1859 1860 1861 1866 |
and complex conditions 1869 1872 |
|
→ to her 1859 1860 1861 1866 |
should not variations useful to natures 1869 |
should not variations useful to nature's 1872 |
|
→ products? 1859 1860 1861 1866 |
products often arise, and be preserved or selected? 1869 1872 |
|