Origin of Species Variorum

→ through natural selection 1859 1860 1861 1866

OMIT 1869 1872

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

Another interesting relation exists, namely between the depth of the sea separating islands from each other or from the nearest continents, and the degree of affinity of their mammalian inhabitants.

→ in 1859 1860 1861

since fully confirmed by Mr. Wallace's admirable researches, in 1866

since greatly extended by Mr. Wallace's admirable researches, in 1869 1872

→ are situated on moderately deep 1859 1860 1861 1866

stand on a moderately shallow 1869 1872

→ closely allied or identical 1859 1860 1861 1866

the same or by very closely allied 1869

the same or by closely allied 1872

→ We see Britain 1859 1860 1861 1866

For instance, Britain is 1869 1872

→ we meet with analogous facts on many islands separated by similar channels from 1859 1860 1861 1866

and so it is with all the islands near the shores of 1869 1872

→ stand on 1859 1860 1861 1866

on the other hand, stand on 1869 1872

→ in all cases depends to a certain degree 1859 1860 1861 1866

which animals of all kinds undergo, partly depends 1869 1872

→through natural selection in their new homes in relation to their new position, and we can understand the presence of endemic bats on

oceanic islands,

islands,

with the absence of all

other terrestrial

terrestrial

mammals. ↑

Besides the absence of terrestrial mammals in relation to the remoteness of islands from continents, there is also a

relation

relation,

to a certain extent independent of distance, between the depth of the sea separating an island from the neighbouring mainland, and the

pre- sence

presence

in both of the same mammiferous species or of allied species in a more or less modified condition. Mr. Windsor Earl has made some striking observations on this

head,

head

→in regard to the great Malay Archipelago, which is traversed near Celebes by a space of deep

ocean,

ocean;

and this

~~space~~

space

separates two widely distinct mammalian faunas. On either side the islands →are situated on moderately deep submarine

bank,

banks,

and

these

these islands

they

are inhabited by →closely allied or identical quadrupeds. No doubt some few anomalies occur in this great archipelago, and there is much difficulty in forming a judgment in some cases owing to the probable naturalisation of certain mammals through man's agency; but we shall soon have much light thrown on the natural history of this archipelago by the admirable zeal and researches of Mr. Wallace. I have not as yet had time to follow up this subject in all

~~other~~

other

quarters of the world; but as far as I have gone, the relation

~~generally~~

generally

holds good. →We see Britain separated by a shallow channel from Europe, and the mammals are the same on both sides; →we meet with analogous facts on many islands separated by similar channels from Australia. The West Indian

Islands,

Islands

→stand on a deeply submerged bank, nearly 1000 fathoms in depth, and here we find American forms, but the species and even the genera are

quite distinct.

distinct.

As the amount of modification →in all cases depends to a certain degree