Comparison with 1872 |
|
on the most distinct breeds. Now,
hardly any cases have been ascertained with certainty of hybrids from two quite distinct species of animals being hardly any cases have been ascertained with certainty of hybrids from two quite distinct species of animals being 1872 |
it is difficult, perhaps impossible, to bring forward one case of the hybrid offspring of two animals
clearly distinct
being themselves
1859 1860 1861 1866 1869 |
perfectly fertile. Some authors believe that long-continued domestication eliminates this strong tendency to
sterility sterility 1872 | sterility: 1859 1860 1861 1866 1869 |
in species. From in species. From 1872 |
from 1859 1860 1861 1866 1869 |
the history of the dog
and of some other domestic animals, this conclusion is probably quite correct, and of some other domestic animals, this conclusion is probably quite correct, 1872 |
I think there is some probability in this hypothesis, 1859 1860 1861 |
and of some other domestic animals, there is great probability in this hypothesis, 1866 1869 |
if applied to species closely related
to each other. to each other. 1872 |
together, though it is unsupported by a single experiment. 1859 1860 1861 |
to each other, though it is unsupported by a single experiment. 1866 1869 |
But to extend
it it 1872 | the hypothesis 1859 1860 1861 1866 1869 |
so far as to suppose that species, aboriginally as distinct as carriers, tumblers, pouters, and fantails now are, should yield offspring perfectly fertile, inter
se
, would be would be 1872 |
seems to me 1859 1860 1861 1866 1869 |
rash in the extreme. |
|
From these several reasons, namely,
— the — the 1872 | the 1859 1860 1861 1866 1869 |
improbability of man having formerly
made made 1872 | got 1859 1860 1861 1866 1869 |
seven or eight supposed species of pigeons to breed freely under domestication;
— these — these 1872 | these 1859 1860 1861 1866 1869 |
supposed species being quite unknown in a wild state, and their
not having become not having become 1872 |
becoming 1859 1860 1861 1866 1869 |
anywhere anywhere 1872 | nowhere 1859 1860 1861 1866 1869 |
feral;
— these species presenting certain — these species presenting certain 1872 |
these species having 1859 1860 1861 1866 1869 |
very abnormal
characters, characters, 1872 | characters 1859 1860 1861 1866 1869 |
...OMIT 1872 |
in certain respects, 1859 1860 1861 1866 1869 |
as compared with all other Columbidæ, though so like
...OMIT 1872 |
in most other respects to 1859 1860 1861 1866 1869 |
the
rock-pigeon rock-pigeon 1872 | rock-pigeon; 1859 1860 1861 1866 1869 |
in most respects; — the occasional re-appearance of the in most respects; — the occasional re-appearance of the 1872 |
the 1859 1860 1861 1866 1869 |
blue colour and various
black marks black marks 1872 |
marks occasionally appearing 1859 1860 |
black marks occasionally appearing 1861 1866 1869 |
in all the breeds, both when kept pure and when crossed;
— and lastly, the — and lastly, the 1872 |
the 1859 1860 1861 1866 1869 |
mongrel offspring being perfectly fertile; — from these several reasons, taken together, I can feel no doubt
that all our domestic breeds
are are 1872 | have 1859 1860 1861 1866 1869 |
descended from the
rock-pigeon or Columba rock-pigeon or Columba 1872 |
Columba 1859 1860 1861 1866 1869 |
livia with its geographical sub-species. |
|
In favour of this view, I may add, firstly,
that
the wild C. livia the wild C. livia 1872 |
C. livia, or the rock-pigeon, 1859 1860 1861 1866 1869 |
has been found capable of domestication in Europe and in India; and that it agrees in habits and in a great number of points of structure with all the domestic breeds. Secondly,
that, although that, although 1872 | although 1859 1860 1861 1866 1869 |
an English carrier or short-faced
tumbler differs immensely in certain
|
on the most distinct breeds. Now,
it is difficult, perhaps impossible, to bring forward one case of the hybrid offspring of two animals
clearly distinct
being themselves
it is difficult, perhaps impossible, to bring forward one case of the hybrid offspring of two animals
clearly distinct
being themselves
1859 1860 1861 1866 1869 |
hardly any cases have been ascertained with certainty of hybrids from two quite distinct species of animals being 1872 |
perfectly fertile. Some authors believe that long-continued domestication eliminates this strong tendency to
sterility: sterility: 1859 1860 1861 1866 1869 | sterility 1872 |
from from 1859 1860 1861 1866 1869 |
in species. From 1872 |
the history of the
dog, dog, 1866 1869 1872 | dog 1859 1860 1861 |
and of some other domestic animals, there is great probability in this hypothesis, and of some other domestic animals, there is great probability in this hypothesis, 1866 1869 |
I think there is some probability in this hypothesis, 1859 1860 1861 |
and of some other domestic animals, this conclusion is probably quite correct, 1872 |
if applied to species closely related
to each other, though it is unsupported by a single experiment. to each other, though it is unsupported by a single experiment. 1866 1869 |
together, though it is unsupported by a single experiment. 1859 1860 1861 |
to each other. 1872 |
But to extend
the hypothesis the hypothesis 1859 1860 1861 1866 1869 | it 1872 |
so far as to suppose that species, aboriginally as distinct as carriers, tumblers, pouters, and fantails now are, should yield offspring perfectly
fertile fertile 1861 1866 1869 1872 | fertile, 1859 1860 |
inter
se
, seems to me seems to me 1859 1860 1861 1866 1869 |
would be 1872 |
rash in the extreme. |
|
From these several reasons, namely,
the the 1859 1860 1861 1866 1869 | — the 1872 |
improbability of man having formerly
got got 1859 1860 1861 1866 1869 | made 1872 |
seven or eight supposed species of pigeons to breed freely under domestication;
these these 1859 1860 1861 1866 1869 | — these 1872 |
supposed species being quite unknown in a wild state, and their
becoming becoming 1859 1860 1861 1866 1869 |
not having become 1872 |
nowhere nowhere 1859 1860 1861 1866 1869 | anywhere 1872 |
feral;
these species having these species having 1859 1860 1861 1866 1869 |
— these species presenting certain 1872 |
very abnormal
characters characters 1859 1860 1861 1866 1869 | characters, 1872 |
in certain respects, in certain respects, 1859 1860 1861 1866 1869 |
OMIT 1872 |
as compared with all other Columbidæ, though so like
in most other respects to in most other respects to 1859 1860 1861 1866 1869 |
OMIT 1872 |
the
rock-pigeon; rock-pigeon; 1859 1860 1861 1866 1869 | rock-pigeon 1872 |
the the 1859 1860 1861 1866 1869 |
in most respects; — the occasional re-appearance of the 1872 |
blue colour and various
black marks occasionally appearing black marks occasionally appearing 1861 1866 1869 |
marks occasionally appearing 1859 1860 |
black marks 1872 |
in all the breeds, both when kept pure and when crossed;
the the 1859 1860 1861 1866 1869 |
— and lastly, the 1872 |
mongrel offspring being perfectly fertile; — from these several reasons, taken together,
we may safely conclude we may safely conclude 1861 1866 1869 1872 |
I can feel no doubt 1859 1860 |
that all our domestic breeds
have have 1859 1860 1861 1866 1869 | are 1872 |
descended from the
Columba Columba 1859 1860 1861 1866 1869 |
rock-pigeon or Columba 1872 |
livia with its geographical sub-species. |
|
In favour of this view, I may add,
firstly, firstly, 1859 1860 1861 1866 1872 | first, 1869 |
that
C. livia, or the rock-pigeon, C. livia, or the rock-pigeon, 1859 1860 1861 1866 1869 |
the wild C. livia 1872 |
has been found capable of domestication in Europe and in India; and that it agrees in habits and in a great number of points of structure with all the domestic breeds. Secondly,
although although 1859 1860 1861 1866 1869 | that, although 1872 |
an English carrier or
a short-faced a short-faced 1866 1869 1872 | short-faced 1859 1860 1861 |
tumbler differs immensely in certain
|