Origin of Species Variorum

→ and this we do find in the several 1872

in the different 1859 1860 1861

in the several 1866 1869

→ OMIT 1872

even within the same class, 1859 1860 1861 1866 1869

→ even within the same class, should 1872

should 1859 1860 1861 1866 1869

→ the same with those in an adjoining 1872

common to other 1859 1860 1861 1866

the same with those in other 1869

→ in islands, there 1872

there 1859 1860 1861 1866 1869

→ of 1859 1860 1861 1866 1872

in islands, of 1869

→ and 1859 1860 1861 1869 1872

in islands, and 1866

→ might have been 1869 1872

were probably 1859 1860 1861

had probably 1866

→ if there exist very closely allied or representative species in 1872

in 1859 1860 1861 1866 1869

→ some 1872

there should be a correlation, in the presence of 1859 1860 1861 1866

where very closely allied or representative species exist, there should almost always exist some 1869

→ will almost always there be found. 1872

of varieties, of doubtful species, and of distinct but representative species. 1859 1860 1861 1866

OMIT 1869

→ in it, but 1869 1872

but 1859 1860 1861 1866

→ former migrations 1866 1869 1872

migration at some former period 1859 1860 1861

→ living during the same 1866 1869 1872

belonging either to a certain 1859 1860 1861

→ living within the same 1866 1869 1872

to a certain 1859 1860 1861

existing in scanty numbers— →and this we do find in the several great geographical provinces of the world.

On these same

principles,

principles

we can understand, as I have endeavoured to show, why oceanic islands should have few inhabitants, but

that of

these

these,

great number

large proportion

should be endemic or peculiar; and why, in relation to the means of migration, one group of

beings,

beings

→OMIT should have all its species

endemic,

peculiar,

and another

group

group,

→even within the same class, should have all its species →the same with those in an adjoining

quarters

quarter

of the world. We can see why whole groups of organisms, as batrachians and terrestrial mammals, should be absent from oceanic islands, whilst the most isolated islands

possess

should possess

their own peculiar species of

aërial

aerial

mammals or bats. We can see

why

why,

→in islands, there should be some relation between the

presence,

presence

→of mammals, in a more or less modified

condition

condition,

→and the depth of the sea between

such

island

islands

and the mainland. We can clearly see why all the inhabitants of an archipelago, though specifically distinct on the several islets, should be closely related to each

other,

other;

and

likewise

should likewise

be related, but less closely, to those of the nearest

continent

continent,

or other source whence immigrants →might have been

been derived.

derived.

We can see

why

why,

→if there exist very closely allied or representative species in two areas, however distant from each other, →some identical

species,

species.

species

→will almost always there be found.

As the late Edward Forbes often insisted, there is a striking parallelism in the laws of life throughout time and

space:

space;

the laws governing the succession of forms in past times being nearly the same with those governing at the present time the differences in different areas. We see this in many facts. The endurance of each species and group of species is continuous in time; for the

exceptions

apparent exceptions

to the rule are so few, that they may fairly be attributed to our not having as yet discovered in an intermediate deposit

the

certain

forms which are

therein

....

absent,

absent

→in it, but which occur

above

both above

and below: so in space, it certainly is the general rule that the area inhabited by a single species, or by a group of species, is

continuous;

continuous,

and the exceptions, which are not rare, may, as I have attempted to show, be accounted for by →former migrations under different

conditions

circumstances,

through

occasional means of transport,

and

by the species having become extinct in the intermediate tracts. Both in time and space, species and groups of species have their points of maximum development. Groups of species, →living during the same period of time, or →living within the same area, are often characterised by trifling

characters

features

in common, as of sculpture or colour. In looking to the long succession of

ages,

past ages,

as in

now

....