Origin of Species Variorum

→ namely, that slight variations generally appear at a not very early period of life, and are inherited at a corresponding not early period, explain, as 1869 1872

if their truth be admitted, will, 1859 1860 1861 1866

→ varieties, 1869 1872

and have probably 1859 1860 1861 1866

→ race-horses— breeds which have been almost wholly formed by selection under domestication— 1869 1872

race-horses 1859 1860 1861 1866

→ OMIT 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

→ this is 1869 1872

the colts have 1859 1860 1861 1866

→ the case. 1869 1872

acquired their full amount of proportional difference. 1859 1860 1861 1866

→ we have conclusive evidence 1869 1872

the evidence appears to me conclusive, 1859 1860 1861 1866

→ the Pigeon are 1869 1872

Pigeon have 1859 1860 1861 1866

→ the young 1869 1872

young pigeons of various breeds, 1859 1860 1861 1866

→ in the wild parent-species, in pouters, fantails, runts, barbs, dragons, carriers, and tumblers, the 1869

the 1859 1860 1861 1866 1872

→ in so extraordinary a degree in the 1869

so extraordinarily in 1859 1860 1861 1866

in so extraordinary a manner in the 1872

→ and in other characters, that 1869 1872

that 1859 1860 1861 1866

→ certainly be ranked as 1869

I cannot doubt, be ranked in 1859 1860 1861

certainly have been ranked as 1866 1872

→ if found in a state of nature. 1869 1872

had they been natural productions. 1859 1860 1861 1866

These two principles, →namely, that slight variations generally appear at a not very early period of life, and are inherited at a corresponding not early period, explain, as I believe,

explain

....

all the above specified leading facts in embryology. But first let us look

a few analogous cases in

domestic

our domestic

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

bull-dog,

bulldog,

though

~~appearing~~

appearing

so different, are really

varieties most

varieties

....

closely

allied,

allied

→varieties, descended from the same wild stock; hence I was curious to see how far their puppies differed from each other: I was told by

breeders

breeder

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

nearly acquired

acquired nearly

their full amount of proportional difference. So, again, I was told that the foals of cart and →race-horses— breeds which have been almost wholly formed by selection under domestication— differed as much as the full-grown animals; →OMIT but having had careful measurements made of the

dam

dams

and of

the

three-days-old

~~old~~

colt

a race

race

race-horses

and heavy

cart-horse,

cart-horses,

I find that →this is by no means →the case.

As →we have conclusive evidence that the

several domestic

....

breeds of →the Pigeon are descended from

one

a single

wild species, I compared →the young within twelve hours after being hatched; I carefully measured →in the wild parent-species, in pouters, fantails, runts, barbs, dragons, carriers, and tumblers, the proportions (but will not here give

details)

the details)

of the beak, width of mouth, length of nostril and of eyelid, size of feet and length of

leg,

leg.