|
| → OMIT 1866 1869 1872 |
| monstrosities, or such 1861 |
|
| → OMIT 1866 1869 1872 |
| Monsters are very apt to be sterile; and 1861 |
|
| → OMIT 1866 1869 1872 |
| at least with animals, 1861 |
|
| → are comparable with 1866 |
| resemble 1869 1872 |
|
| → like that 1866 1869 |
| and if any wild species 1872 |
|
| → tapir or elephant. Now, if any wild species of the piggenus 1866 |
| tapir or elephant. Now, if any wild species of the pig-genus 1869 |
| same genus 1872 |
|
| → had 1866 1872 |
| in like manner had suddenly 1869 |
|
| → after diligent search, to find, in nearly allied forms, 1866 |
| to find, after diligent search, 1869 1872 |
|
| → resembling each other. 1866 |
| in nearly allied forms, and these alone would bear on the question. 1869 |
| in nearly allied forms, and these alone bear on the question. 1872 |
|
| → they must be crossed with the ordinary form, and their character. will be transmitted in a modified state. 1866 |
| their preservation would depend on unusually favourable circumstances. 1869 1872 |
|
| supposed not to be
but who can say that the dwarfed condition of shells in the brackish waters of the Baltic, or dwarfed plants on Alpine summits, or the thicker fur of an animal from far northwards, would not in some cases be inherited for at least
few generations? and in this case I presume that the form would be called a variety. |
|
| It may
be doubted whether
→OMIT
sudden and
deviations of structure
we occasionally see in our domestic productions, more especially with plants, are ever permanently propagated in a state of nature.
→OMIT
every part of every organic
→OMIT
is so beautifully related to its complex conditions of life that it seems as improbable that any part should have been suddenly produced perfect, as that a complex machine should have been invented by man in a perfect state. Under domestication monstrosities
occur which
→are comparable with
normal
Thus pigs have
been born with a sort of
→like that
of the
→tapir or elephant. Now, if any wild species of the piggenus
had naturally possessed a proboscis, it might have been argued that this
→had
as a monstrosity; but I have as yet
→after diligent search, to find, in nearly allied forms,
cases of monstrosities
normal structures
→resembling each other. If monstrous forms of this kind ever do appear in a state of nature and are capable of
(which is not always the case), as they occur rarely and singly,
→they must be crossed with the ordinary form, and their character. will be transmitted in a modified state. If perpetuated in this crossed state, their preservation will be almost necessarily due to the modification being in some way beneficial to the animal under its then existing conditions of life; so that, even in this case, natural selection will come into play.
|
