Origin of Species Variorum

→ and have probably 1859 1860 1861 1866

varieties, 1869 1872

→ 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

in embryology. But first let us look

a few analogous cases in

our domestic

domestic

varieties. Some authors who have written on Dogs, maintain that the greyhound and

bulldog,

bull-dog,

though

~~appearing~~

appearing

so different, are really

varieties most

~~varieties~~

varieties

closely

allied

allied,

→and have probably descended from 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

three-days-old

three-days

~~old~~

old

colts

colt

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,

~~the~~

the

~~wild~~

wild

parent-species,

~~stock,~~

~~pouters,~~

~~fantails,~~

~~runts,~~

~~barbs,~~

~~dragons,~~

~~carriers,~~

~~and~~

~~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