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seems to me 1859 1860 1861 1866 1869
would be 1872

becoming 1859 1860 1861 1866 1869
not having become 1872

these species having 1859 1860 1861 1866 1869
— these species presenting certain 1872

in certain respects, 1859 1860 1861 1866 1869
OMIT 1872

in most other respects to 1859 1860 1861 1866 1869
OMIT 1872

the 1859 1860 1861 1866 1869
in most respects; — the occasional re-appearance of the 1872

black marks occasionally appearing 1861 1866 1869
marks occasionally appearing 1859 1860
black marks 1872

the 1859 1860 1861 1866 1869
— and lastly, the 1872

we may safely conclude 1861 1866 1869 1872
I can feel no doubt 1859 1860

Columba 1859 1860 1861 1866 1869
rock-pigeon or Columba 1872

C. livia, or the rock-pigeon, 1859 1860 1861 1866 1869
the wild C. livia 1872

in these two cases, and in some but not in all other cases, an almost perfect series 1866 1869
an almost perfect series 1859 1860 1861
OMIT 1872

extremes of structure. 1859 1860 1861 1866 1869
and the rock pigeon, an almost perfect series; so we can in some other cases, but not with all the breeds. 1872

for 1859 1860 1861 1866 1869
are in each eminently variable, for 1872

are in each breed eminently variable; 1859 1860 1861 1866 1869
OMIT 1872

yield offspring perfectly
fertile,
fertile
inter se , seems to me rash in the extreme.
From these several reasons, namely,
— the
the
improbability of man having formerly
made
got
seven or eight supposed species of pigeons to breed freely under domestication;
— these
these
supposed species being quite unknown in a wild state, and their becoming
anywhere
nowhere
feral; these species having very abnormal
characters,
characters
in certain respects, as compared with all other Columbidæ, though so like in most other respects to the
rock-pigeon
rock-pigeon;
the blue colour and various black marks occasionally appearing in all the breeds, both when kept pure and when crossed; the mongrel offspring being perfectly fertile; — from these several reasons, taken together, we may safely conclude that all our domestic breeds
are
have
descended from the Columba livia with its geographical sub-species.
In favour of this view, I may add,
firstly,
first,
that C. livia, or the rock-pigeon, 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
although
an English carrier or
short-faced
a short-faced
tumbler differs immensely in certain characters from the rock-pigeon, yet
that, by
by
comparing the several sub-breeds of these
breeds,
two races,
varieties,
more especially those brought from distant countries, we can
make,
make
in these two cases, and in some but not in all other cases, an almost perfect series between
them
the
extremes of structure. Thirdly, those characters which are mainly distinctive of each
breed
breed,
for instance the wattle and length of beak of the carrier, the shortness of that of the tumbler, and the number of tail-feathers in the
fantail;
fantail,
are in each breed eminently variable; and the explanation of this fact will be obvious when we
come to
come to
treat of
selection.
Selection.