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1859
1860
1861
1866
1869
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Compare with:
1860
1861
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have 1859 1860 1861 1866 1869
species have now 1872

from various sources 1859 1860 1861 1866
OMIT 1869 1872

number of kinds of inhabitants is scanty, 1859 1860 1861
number of the inhabitants is scanty 1866
species are few in number, 1869 1872

the 1859 1860 1861 1869 1872
in kind, the 1866

( i . e . 1859
( I. e. 1860 1869
( i.e. 1861 1866 1872

expected on my theory, 1859 1860 1861 1866
theoretically expected, 1869 1872

in 1859 1860 1861
of time in 1866 1869 1872

with facility and 1859 1860 1861 1866
OMIT 1869 1872

disturbed. 1859
disturbed; and partly on the frequent arrival of unmodified immigrants from the mother-country, and the consequent intercrossing with them. 1860 1861
disturbed; and partly on the frequent arrival of un- modified immigrants from the mother-country, and the consequent intercrossing with them. 1866
disturbed; and partly on the frequent arrival of unmodified immigrants from the mother-country, with which the insular forms have intercrossed. 1869 1872

2 blocks not present in 1859; present in 1860 1861 1866 1869 1872
With respect to the effects of this intercrossing, it should be remembered that the offspring of such crosses would almost certainly gain in vigour; so that even an occasional cross would produce more effect than might at first have been anticipated. To give a few examples: in the Galapagos Islands nearly every land-bird, but only two out of the eleven marine birds, are peculiar; and it is obvious that marine birds could arrive at these islands more easily than land-birds.

plants; yet many have
now become
become
naturalised on it, as they have
in
on
New Zealand and on every other oceanic island which can be named. In St. Helena there is reason to believe that the naturalised plants and animals have nearly or quite exterminated many native productions. He who admits the doctrine of the creation of each separate species, will have to
admit
admit,
that a sufficient number of the best adapted plants and animals
were
have
not
been
been
created
for
on
oceanic islands; for man has unintentionally stocked them from various sources far more fully and perfectly than
did
has
nature.
Although in oceanic islands the number of kinds of inhabitants is scanty, the proportion of endemic
kinds
species
( i . e . those found nowhere else in the world) is often extremely large. If we compare, for instance, the number of
the
the
endemic land-shells in Madeira, or of
the
the
endemic birds in the Galapagos Archipelago, with the number found on any continent, and then compare the area of the
island
islands
with that of the continent, we shall see that this is true. This fact might have been expected on my theory, for, as already explained, species occasionally arriving after long intervals in a new and isolated district, and having to compete with new associates,
would
will
be eminently liable to modification, and
would
will
often produce groups of modified descendants. But it by no means
follows
follows,
that, because in an island nearly all the species of one class are peculiar, those of another class, or of another section of the same class, are peculiar; and this difference seems to depend
partly on
on
the species which
are
do
not
become
become
modified having immigrated with facility and in a body, so that their mutual relations have not been much disturbed. Thus in the Galapagos Islands nearly every land-bird, but only two out of the eleven marine birds, are peculiar; and it is obvious that