Origin of Species Variorum

→ nearest mainland,— are, I think, utterly inexplicable on the ordinary view of the 1859 1860 1861 1866

OMIT 1869 1872

→ on the view of 1859 1860 1861 1866

if we admit 1869 1872

→ modification and better 1859 1860 1861 1866

OMIT 1869 1872

→ occurred within the same period; 1859 1860 1861 1866

probably occurred,— 1869 1872

→ transport,— a subject which has hardly ever been properly experimented on; 1861 1866

transport,— a subject which has hardly ever been properly experimentised on; 1859 1860

trans- port,— 1869

transport,— 1872

→ how 1859 1860 1861 1866 1869

and this is a very important consideration, how 1872

→ tracts, 1861 1866

tracts, I think 1859 1860

tracts,— 1869 1872

→ in 1859 1860 1861 1866

is not insuperable in 1869 1872

→ the same parents, are not insuperable. 1859 1860 1861 1866

common parents. 1869 1872

→ and 1859 1860 1861 1866

of all kinds, and 1869 1872

→ change most 1859 1860 1861 1866

have changed very 1869 1872

→ I do not think that 1859 1860 1861 1866

OMIT 1869 1872

of the →nearest mainland,— are, I think, utterly inexplicable on the ordinary view of the independent creation of each species, but are explicable →on the view of colonisation from the nearest

and

readiest source, together with the subsequent →modification and better adaptation of the colonists to their new homes.

Summary

last

the last

last

and

present

Chapters .—

Chapter .

Chapters .

Chapter .—

In these chapters I have endeavoured to show, that if we make due allowance for our ignorance of the full effects of

the

~~all the~~

all the

changes of climate and of the level of the land, which have certainly occurred within the recent period, and of other

~~similar~~

similar

changes which

~~may~~

may

have →occurred within the same period; if we remember how

~~profoundly~~

profoundly

ignorant we are with respect to the many

~~and~~

and

curious means of occasional →transport,— a subject which has hardly ever been properly experimented on; if we bear in

mind,

mind

→how often a species may have ranged continuously over a wide area, and then have become extinct in the intermediate →tracts, the

difficulty

difficulties

→in believing that all the individuals of the same species, wherever

found, are

located, have

descended from →the same parents, are not insuperable. And we are led to this conclusion, which has been arrived at by many naturalists under the designation of single centres of creation, by

various

some

general considerations, more especially from the importance of barriers →and from the analogical distribution of sub-genera, genera, and families.

With respect to

~~the~~

the

distinct species

belonging to

the same genus, which on

our

theory

~~must~~