Origin of Species Variorum

→ a considerable amount of difference 1859 1860 1861 1866

that they differ considerably 1869 1872

→ view of the islands having 1859 1860 1861 1866

islands have 1869 1872

→ island. 1859 1860 1861 1866

island, though all proceeding from the same general source. 1869 1872

→ settled on any one or more 1859 1860 1861 1866

first settled on one 1869 1872

→ more perfectly 1859 1860 1861 1866

best fitted for it 1869 1872

→ distinct plants in one island than in another, and it 1859 1860 1861 1866

somewhat different species in the different islands, and 1869 1872

→ and 1859 1860 1861 1866

throughout a continent and 1869 1872

→ formed in the separate islands have not quickly spread 1859 1860 1861 1866

after being formed in any one island, did not quickly spread 1869

after being formed in any one island, did not spread quickly 1872

→ a good many 1859 1860 1861

some of the 1866 1869 1872

we find →a considerable amount of difference in the several islands. This difference might indeed have been expected

the →view of the islands having been stocked by occasional means of transport— a seed, for instance, of one plant having been brought to one island, and that of another

plant,

plant

to another →island.

Hence,

Hence

when in former times an immigrant →settled on any one or more of the islands, or when it subsequently spread from one

~~island~~

island

to another, it would undoubtedly be exposed to different conditions

~~of life~~

of life

in the different islands, for it would have to compete with

a different

set

organisms;

plant,

for instance, would find the

~~best-fitted~~

best-fitted

ground →more perfectly occupied by →distinct plants in one island than in another, and it would be exposed to the attacks of somewhat different enemies. If then it varied, natural selection would probably favour different varieties in the different islands. Some species, however, might spread and yet retain the same character throughout the group, just as we see

~~on continents~~

on continents

some species spreading widely →and remaining the same.

The really surprising fact in this case of the Galapagos Archipelago, and in a lesser degree in some analogous

cases,

instances,

is that

each

the

new species →formed in the separate islands have not quickly spread to the other islands. But the islands, though in sight of each other, are separated by deep arms of the sea, in most cases wider than the British Channel, and there is no reason to suppose that they have at any former period been continuously united. The currents of the sea are rapid and sweep

between

across

the

islands,

archipelago,

and gales of wind are extraordinarily rare; so that the islands are far more effectually separated from each other than they appear

~~to be~~

to be

on a map. Nevertheless →a good many