Origin of Species Variorum

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

I may add, that when under nature the conditions of life do change, variations and reversions of character probably do occur; but natural selection, as will hereafter be explained, will determine how far the new characters thus arising shall be preserved.

→ OMIT 1866 1869 1872

same species, also, often 1859 1860 1861

→ only in most cases 1866 1869

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

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

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

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

OMIT 1872

→ nature. 1859 1860 1861 1866 1869

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

→ 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

for an

almost infinite

unlimited

number of generations, would be opposed to all experience. ↑

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,

→only in most cases in a →less degree, in the same manner as do closely-allied species of the same genus in a state of →nature.

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;