Origin of Species Variorum

→ OMIT 1869 1872

his powers of 1859 1860 1861 1866

→ selection or the survival of the fittest. 1869

selection. 1859 1860 1861 1866

selection, that is by the survival of the fittest. 1872

→ Extinction caused by Natural Selection. 1869

Extinction .— 1859

Extinction. — 1860 1861

Extinction caused by Natural Selection. 1866 1872

→ Owing to 1869 1872

But as from 1859 1860

From 1861 1866

→ the full number of its existing inhabitants, and as most areas are already stocked with a great diversity of forms, 1861 1866 1869

inhabitants, 1859 1860

inhabitants; 1872

→ it follows 1859 1860 1861 1866 1869

and it follows from this, 1872

→ each selected and 1859 1860 1861 1866 1869

the 1872

→ represented 1859 1860 1861 1866 1869

which is represented 1872

→ during 1859 1860 1861 1866 1869

run a good chance of utter extinction, during great 1872

→ seasons or 1859 1860 1861 1866 1869

nature of the seasons, or from a temporary increase 1872

→ continually and slowly being 1859 1860 1861 1866 1869

OMIT 1872

→ the number of 1859 1860 1861 1866 1869

OMIT 1872

→ goes on perpetually and almost 1859 1860 1861 1866 1869

can go on 1872

→ many inevitably 1866 1869

numbers inevitably 1859 1860 1861

in number, many old forms 1872

→ tells us plainly; and we shall presently attempt to show why it is that 1861 1866 1869

shows us plainly; and indeed we can see reason why they should not have thus increased, for 1859 1860

plainly tells us; and we shall presently attempt to show why it is that 1872

→ species throughout the world has not become immeasurably great. 1861 1866 1869 1872

places in the polity of nature is not indefinitely great,— not that we have any means of knowing that any one region has as yet got its maximum of species. 1859 1860

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

Probably no region is as yet fully stocked, for at the Cape of Good Hope, where more species of plants are crowded together than in any other quarter of the world, some foreign plants have become naturalised, without causing, as far as we know, the extinction of any natives.

man can do much by →OMIT artificial selection, I can see no limit to the amount of change, to the beauty and

~~infinite~~

infinite

complexity of the coadaptations between all organic beings, one with another and with their physical conditions of life, which may

have been

affected

effected

in the long course of time

through

nature's power of →selection or the survival of the fittest.

→ Extinction caused by Natural Selection.

This subject will be more fully discussed in our chapter on Geology; but it must

here be

be here

alluded to from being intimately connected with natural selection. Natural selection acts solely through the preservation of variations in some way advantageous, which consequently endure. →Owing to the high geometrical

powers

rate

ratio

of increase of all organic beings, each area is already

fully

....

stocked with →the full number of its existing inhabitants, and as most areas are already stocked with a great diversity of forms, →it follows

that

that,

as →each selected and favoured

forms

form

increase

increases

in number,

so, generally,

will

generally will

the less favoured

~~forms~~

forms

decrease and become rare. Rarity, as geology tells us, is the precursor to extinction. We

can

can,

~~also,~~

also,

see that any form →represented by few individuals

will

will,

→during fluctuations in the →seasons or in the number of its

enemies.

~~run~~

~~good~~

~~chance~~

~~utter~~

~~extinction.~~

But we may go further than this;

for,

for

as new forms are →continually and slowly being produced, unless we

admit

believe

that →the number of specific forms →goes on perpetually and almost indefinitely

increasing

increasing,

→many inevitably must become extinct. That the number of specific forms has not indefinitely increased, geology →tells us plainly; and we shall presently attempt to show why it is that the number of →species throughout the world has not become immeasurably great. ↑

We have seen that the species which are most

numerous

nume- rous