Origin of Species Variorum

→ OMIT 1866 1869 1872

same species, also, often 1859 1860 1861

→ in the same manner as do the closely allied species of the same genus 1872

in the same manner as, only in most cases 1859 1860 1861

only in most cases 1866 1869

→ OMIT 1872

lesser degree than, do closely-allied species of the same genus in a 1859 1860 1861

lesser degree, in the same manner as do closely-allied species of the same genus in a 1866

less degree, in the same manner as do closely-allied species of the same genus in a 1869

→ nature, but the differences in most cases are less in degree. 1872

nature. 1859 1860 1861 1866 1869

→ as true, for the 1869 1872

when we find that there are hardly any 1859 1860 1861 1866

→ of many animals and plants have 1869 1872

either amongst animals or plants, which have not 1859 1860 1861 1866

→ the descendants of aboriginally distinct species, 1861 1866 1869 1872

mere varieties, 1859 1860

→ mere varieties. 1861 1866 1869 1872

the descendants of aboriginally distinct species. 1859 1860

→ It can 1869 1872

I think it could 1859 1860

I think it can 1861 1866

↑ 1 blocks not present in 1869 1872; present in 1859 1860 1861 1866

Moreover, on the view of the origin of genera which I shall presently give, we have no right to expect often to meet with generic differences in our domesticated productions.

→ OMIT 1872

of the same species, 1859 1860 1861 1866 1869

→ the whole amount of difference between the several breeds of the dog has been produced under domestication; I believe that a small part of the difference is due to their being 1872

all our dogs have 1859

Character of Domestic

Varieties;

Varieties:

difficulty of distinguishing between Varieties and Species; origin of Domestic Varieties from one or more Species.

When we look to the hereditary varieties or races of our domestic animals and plants, and compare them with

species

....

closely allied

together,

species,

we generally perceive in each domestic race, as already remarked, less uniformity of character than in true species. Domestic races

of the

often

→OMIT have a somewhat monstrous character; by which I mean, that, although differing from each other, and from

the

....

other species of the same genus, in several trifling respects, they often differ in an extreme degree in some one part, both when compared one with another, and more especially when compared with

all

....

the species

under

nature to which they are nearest allied. With these exceptions (and with that of the perfect fertility of varieties when crossed, — a subject hereafter to be discussed), domestic races of the same species differ from each

other,

other

→in the same manner as do the closely allied species of the same genus in a →OMIT state of →nature, but the differences in most cases are less in degree.

I think

....

this

that this

This

must be

admitted,

admitted

→as true, for the domestic

races,

races

→of many animals and plants have been ranked by

~~some~~

some

competent judges as →the descendants of aboriginally distinct species, and by other competent judges as →mere varieties. If any

marked

well marked

distinction existed between

domestic

a domestic

races

race

and

species,

a species,

this source of doubt

could

would

not so perpetually recur. It has often been stated that domestic races do not differ from each other in characters of generic value. →It can be shown that this statement is

hardly

not

correct; but naturalists differ

most widely

widely

much

in determining what characters are of generic value; all such

valua- tions

valuations

being at present empirical. When it is explained how genera originate under nature, it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races. ↑

When we

attempt

attempting

to estimate the amount of structural difference between

the

allied

domestic

races

races,

→OMIT we are soon involved in doubt, from not knowing whether they

have

are

descended from one or several

parent-species.

parent species.

This point, if it could be cleared up, would be interesting; if, for instance, it could be shown that the

grey- hound,

greyhound,

bloodhound, terrier, spaniel, and bull-dog, which we all know propagate their kind

....

truly, were the offspring of any single species, then such facts would have great weight in making us doubt about the immutability of the many

very

....

closely allied

and

....

natural species — for instance, of the many foxes — inhabiting different quarters of the world. I do not believe, as we shall presently see, that →the whole amount of difference between the several breeds of the dog has been produced under domestication; I believe that a small part of the difference is due to their being