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race-horses 1859 1860 1861 1866
race-horses— breeds which have been almost wholly formed by selection under domestication— 1869 1872

and this surprised me greatly, as I think it probable that the difference between these two breeds has been wholly caused by selection under domestication; 1859 1860 1861 1866
OMIT 1869 1872

the colts have 1859 1860 1861 1866
this is 1869 1872

acquired their full amount of proportional difference. 1859 1860 1861 1866
the case. 1869 1872

the evidence appears to me conclusive, 1859 1860 1861 1866
we have conclusive evidence 1869 1872

Pigeon have 1859 1860 1861 1866
the Pigeon are 1869 1872

young pigeons of various breeds, 1859 1860 1861 1866
the young 1869 1872

the 1859 1860 1861 1866 1872
in the wild parent-species, in pouters, fantails, runts, barbs, dragons, carriers, and tumblers, the 1869

so extraordinarily in 1859 1860 1861 1866
in so extraordinary a degree in the 1869
in so extraordinary a manner in the 1872

that 1859 1860 1861 1866
and in other characters, that 1869 1872

I cannot doubt, be ranked in 1859 1860 1861
certainly have been ranked as 1866 1872
certainly be ranked as 1869

had they been natural productions. 1859 1860 1861 1866
if found in a state of nature. 1869 1872

be distinguished from each other, yet their 1859 1860 1861 1866
just be distinguished, yet the 1869
just be distinguished, the 1872

the same wild stock; hence I was curious to see how far their puppies differed from each other: I was told by
breeder
breeders
that they differed just as much as their parents, and this, judging by the eye, seemed almost to be the case; but on actually measuring the old dogs and their
six-days-old
six-days old
puppies, I found that the puppies had not
acquired nearly
nearly acquired
their full amount of proportional difference. So, again, I was told that the foals of cart and race-horses differed as much as the full-grown animals; and this surprised me greatly, as I think it probable that the difference between these two breeds has been wholly caused by selection under domestication; but having had careful measurements made of the
dams
dam
and of
the
a
a
three-days-old
three-days
old
old
colts
colt
of
race-horses
race
a race
and heavy
cart-horses,
cart-horse,
I find that the colts have by no means acquired their full amount of proportional difference.
As the evidence appears to me conclusive, that the
several domestic
several domestic
breeds of Pigeon have descended from
a single
one
wild species, I compared young pigeons of various breeds, within twelve hours after being hatched; I carefully measured the proportions (but will not here give
the details)
details)
of the beak, width of mouth, length of nostril and of eyelid, size of feet and length of
leg.
leg,
in
in
the
the
wild
wild
parent-species,
stock,
stock,
in
in
pouters,
pouters,
fantails,
fantails,
runts,
runts,
barbs,
barbs,
dragons,
dragons,
carriers,
carriers,
and
and
tumblers.
tumblers.
Now some of these birds, when mature, differ so extraordinarily in length and form of beak, that they
would
would,
I cannot doubt, be ranked in distinct
genera
genera,
had they been natural productions. But when the nestling birds of these several breeds were placed in a row, though most of them could be distinguished from each other, yet their proportional differences in the above specified
several
several
points were incomparably less than in the full-grown birds. Some characteristic points of difference— for instance, that of the width of mouth— could hardly be detected in the