Origin of Species Variorum

→ feel little curiosity, 1859 1860 1861 1866

be dull, 1869 1872

→ on my theory, 1859 1860 1861 1866

OMIT 1869 1872

→ or, 1859 1860 1861 1866

each other, or, 1869 1872

→ like each other. 1859 1860 1861 1866

alike. 1869 1872

→ natural 1859 1860 1861 1866 1869

variation and natural 1872

→ in a quite 1859 1860 1861 1866

in a 1869

probably in a 1872

→ and reaction, in their mutual struggles for life;— 1859 1860 1861 1866

of the inhabitants on each other in leading to the preservation of different modifications; 1869 1872

→ being, 1859 1860 1861 1866

in the struggle for life being, 1869 1872

the American continent and in the American seas. We see in these facts some deep organic bond,

~~prevailing~~

prevailing

throughout space and time, over the same areas of land and water,

~~and~~

and

independently

independent

~~their~~

their

physical conditions. The naturalist must →feel little curiosity, who is not led to inquire what this bond is.

The

This

bond

bond,

→on my theory, is simply inheritance, that cause which alone, as far as we positively know, produces organisms quite

like,

→or, as we see in the case of

varieties

varieties,

nearly →like each other. The dissimilarity of the inhabitants of different regions may be attributed to modification through →natural selection, and →in a quite subordinate degree to the

definite

direct

influence of different physical conditions. The

degrees

degree

of dissimilarity will depend on the migration of the more dominant forms of life from one region into another having been

prevented

~~effected with~~

effected with

more or less

effectually,

effectually prevented,

ease,

at periods more or less remote;— on the nature and number of the former

immigrants; —

immigrants;—

and on

the

their

action →and reaction, in their mutual struggles for life;— the relation of organism to organism →being, as I have already often remarked, the most important of all relations. Thus the high importance of barriers comes into play by checking migration; as does time for the slow process of modification through natural selection. Widely-ranging species, abounding in individuals, which have already triumphed over many competitors in their own widely-extended

homes,

homes

will have the best chance of seizing on new places, when they spread into new countries. In their new homes they will be exposed to new conditions, and will frequently undergo further modification and improvement; and thus they will become still further victorious, and will produce groups of modified descendants. On this principle of inheritance with modification, we can understand how it is that sections of genera, whole genera,