Origin of Species Variorum

→ The 1859 1860 1861 1866 1869

These facts are explained by the above 1872

→ two principles above given, namely that variations do not generally supervene at a very early age, and that they are inherited at a corresponding age whatever that may have been, seem to me to 1866

two principles above given seem to me to 1859 1860 1861

above two principles 1869

two principles. 1872

→ several facts regarding the later developmental stages of our domestic varieties. 1866

OMIT 1872

facts in regard to the later embryonic stages of our domestic varieties. Fanciers select their horses, dogs, and pigeons, for breeding, when they are nearly grown up: they are indifferent whether the desired qualities and structures have been acquired earlier or later in life, if the full-grown animal possesses them. 1859 1860 1861

facts. Fanciers select for breeding their dogs, horses, pigeons, &c., when nearly grown up: they are indifferent whether the desired qualities are acquired earlier or later in life, if the full-grown animal possesses them. 1869

→ Fanciers select their horses, dogs, and pigeons, for breeding, when they are nearly grown up: they are indifferent whether the desired qualities and structures have been 1866

And the cases just given, more especially that of pigeons, seem to show that the characteristic differences which give value to each breed, and which have been 1859 1860 1861

And the cases just given, more especially that of pigeons, show that the characteristic differences which give value to the breeds and which have been 1869

Fanciers select their dogs, horses, pigeons, &c., for breeding, when nearly grown up: they are indifferent whether the desired qualities are 1872

→ acquired earlier or later in life, if the full-grown animal possesses them. 1866 1872

accumulated by man's selection, have not generally first appeared at an early period of life, and have been inherited by the offspring at a corresponding not early period. 1859 1861

accumulated by mans selection, have not generally first appeared at an early period of life, and have been inherited by the offspring at a corresponding not early period. 1860

accumulated by mans selection, have not generally appeared at a very early period of life, and have been inherited at a corresponding not early period. 1869

→ just given, more especially that of pigeons, seem to show that 1866

of the short-faced tumbler, which when twelve hours old had acquired its proper proportions, proves that this is not the universal rule; for here 1859 1860 1861

of the short-faced tumbler, which when twelve hours old possessed its proper characters, proves that this is not the universal rule; for here 1869

just given, more especially that of the pigeons, show that 1872

→ which give value to each breed, and which 1866

must either have appeared at an earlier period than usual, or, if not so, the differences must 1859 1860 1861 1869

which 1872

→ accumulated by man's selection, have not generally first appeared 1866

inherited, not at the corresponding, but 1859 1860 1861

inherited, not at a corresponding, but 1869

accumulated by man's selection, and which give value to his breeds, do not generally appear 1872

→ early period of life, and have been inherited by the offspring at a corresponding not early period. 1866

earlier age. 1859 1860 1861 1869

early period of life, and are inherited at a corresponding not early period. 1872

→ facts and the above two principles 1866

facts and the above two principles— which latter, though not proved true, can be shown to be in some degree probable— 1859 1860 1861

two principles 1869 1872

→ on my theory 1859 1860 1861 1866

OMIT 1869 1872

→ one parent-species, and of which the several new species have become 1859 1860 1861 1866

ancient form and 1869 1872

→ in accordance with their diverse 1859 1860 1861 1866

for different 1869 1872

→ at a rather late 1859 1860 1861 1866

in the several species at a not early 1869 1872

→ of the new species of our supposed genus will manifestly tend to 1859 1860 1861 1866

will be left but little modified and will 1869

will have been but little modified, and they will still 1872

→ whole families or even 1859 1860 1861 1866

widely distinct structures and to whole 1869 1872

→The →two principles above given, namely that variations do not generally supervene at a very early age, and that they are inherited at a corresponding age whatever that may have been, seem to me to

~~explain~~

explain

~~these~~

these

→several facts regarding the later developmental stages of our domestic varieties. →Fanciers select their horses, dogs, and pigeons, for breeding, when they are nearly grown up: they are indifferent whether the desired qualities and structures have been →acquired earlier or later in life, if the full-grown animal possesses them.

But

And

the

case

cases

→just given, more especially that of pigeons, seem to show that the characteristic differences →which give value to each breed, and which have been →accumulated by man's selection, have not generally first appeared at

a very

→early period of life, and have been inherited by the offspring at a corresponding not early period. But the case of the short-faced tumbler, which when twelve hours old

possessed

had acquired

its proper

characters,

proportions,

proves that this is not the universal rule; for here the characteristic differences must either have appeared at an earlier period than usual, or, if not so, the differences must have been inherited, not at

the

corresponding, but at an earlier age.

Now let us apply these →facts and the above two principles to species in a state of nature. Let us take a

group

genus

of birds, descended →on my theory from some →one parent-species, and of which the several new species have become modified through natural selection →in accordance with their diverse habits. Then, from the many slight successive

~~steps of~~

steps of

variations

variation

having supervened →at a rather late age, and having been inherited at a corresponding age, the young →of the new species of our supposed genus will manifestly tend to resemble each other much more closely than do the

adults,—

adults,

just as we have seen

with

the

breeds

case

the pigeon.

pigeons.

We may extend this view to →whole families or even classes. The fore-limbs, for instance,