Origin of Species Variorum

→ their relation 1869

that the inhabitants, when not identically the same, yet are plainly related 1859 1860 1861 1866

the relation 1872

→ source 1869 1872

inhabitants of that region 1859 1860 1861 1866

→ most easily derived, together with their subsequent modification, 1869 1872

derived,— the colonists having been subsequently modified and better fitted to their new homes,— 1859 1860 1861 1866

→ species have become widely spread 1869 1872

forms, chiefly of plants, have spread widely throughout the world 1859 1860 1861 1866

→ belonging to American 1869 1872

American 1859 1860 1861 1866

→ allowed many of 1869

given 1859 1860 1861

allowed 1866 1872

→ species to prevail through large portions of the 1869

general forms to the whole 1859 1860 1861

fresh-water productions to prevail throughout the 1866

forms to prevail throughout large portions of the 1872

→ the 1859 1860 1866 1869 1872

some of the 1861

→ character of most of the blind 1866 1869 1872

blind 1859 1860 1861

→ closely allied or 1859 1869 1872

closely-allied 1860 1861 1866

→ and wherever many closely-allied species occur, there will be found many forms which some naturalists rank as distinct species, and others as mere varieties; these doubtful forms showing us the steps in the progress of modification. 1869 1872

showing, in accordance with the foregoing view, that at some former period there has been intercommunication or migration between the two regions. 1859 1860 1861

showing, in accordance with the foregoing views, that at some former period there has been intercommunication or migration between the two regions. 1866

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

And wherever many closely-allied species occur, there will be found many forms which some naturalists rank as distinct species, and some as varieties; these doubtful forms showing us the steps in the process of modification.

→ OMIT 1869 1872

under different physical conditions, 1859 1860 1861 1866

→ OMIT 1869 1872

allied to it, 1859 1860 1861 1866

namely, →their relation to the →source whence colonists could

most readily

....

have been →most easily derived, together with their subsequent modification, is of the widest application throughout nature. We see this on every

mountain,

mountain-summit,

in every lake and marsh. For Alpine species, excepting in

far as the same →species have become widely spread during the

~~recent~~

recent

Glacial epoch, are related to those of the surrounding

lowlands;

lowlands;—

thus we have in South America, Alpine humming-birds, Alpine rodents, Alpine

plants, &c.,

plants,&c.,

all

of strictly

strictly of

strictly

→belonging to American

forms,

forms;

and it is obvious that a mountain, as it became slowly upheaved, would

naturally

....

be colonised from the surrounding lowlands. So it is with the inhabitants of lakes and marshes, excepting in so far

that

great facility of transport has →allowed many of the same →species to prevail through large portions of the world. We see this same principle in →the →character of most of the blind animals inhabiting the caves of America and of Europe. Other analogous facts could be given.

And it

will, I believe, be

~~universally~~

universally

found

to be

universally

....

true, that wherever in two regions, let them be ever so distant, many →closely allied or

or representative

representative

species occur, there will likewise be found some identical

species,

species;

→and wherever many closely-allied species occur, there will be found many forms which some naturalists rank as distinct species, and others as mere varieties; these doubtful forms showing us the steps in the progress of modification. ↑

This

The

relation between the power and extent of migration

of a

in a

in certain

species, either at the present

time

....

or at some former

period

period,

→OMIT and the existence at remote points of the world of

other

closely-allied

allied

species

species,

→OMIT is shown in another and more general way. Mr. Gould remarked to me long ago, that in those genera of birds which range over the world, many of the species have very wide ranges. I can hardly doubt that this rule is generally true, though