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1859
1860
1861
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1869
1872

Compare with:
1859
1860
1861
1869
1872

already occupying any pond, 1859 1860 1861 1866
in kind, 1869 1872

of kinds 1859 1860 1861 1866
even in a well-stocked pond 1869 1872

compared with those on the 1859 1860 1861 1866
in comparison with the number of species inhabiting an equal area of 1869 1872

will 1859 1860 1861 1866 1869
between them will 1872

average for the 1859 1860 1861 1866 1869
OMIT 1872

as fresh-water productions ever can range, 1859 1860 1861 1866 1869
OMIT 1872

I believe mainly depends 1859 1860 1861 1866 1869
apparently depends in main part 1872

to another and often distant 1859 1860 1861 1866
OMIT 1869 1872

water. 1859 1860 1861 1866
water to another. 1869 1872

is first formed, for instance, on a rising islet, it will be unoccupied; and a single seed or egg will have a good chance of succeeding. Although there will always be a struggle for life between the
inhabitants
individuals
of the
same pond,
species,
however
few
few,
already occupying any pond,
yet
yet,
as the number of kinds is
small
small,
compared with those on the land, the competition will probably be less severe
between aquatic
between aquatic
than between terrestrial species; consequently an intruder from the waters of a foreign
country
country,
will
would
have a better chance of seizing on a
new place,
place,
than in the case of terrestrial colonists. We
should,
should
also,
also
remember that
some, perhaps
some, perhaps
many
many,
fresh-water productions are low in the scale of nature, and
that
that
we have reason to believe that
such
such
low
low
beings
change or
change or
become modified
more slowly
less quickly
than the high; and this will give
a longer
longer
longer
time
for
than
the average for the migration of
the same
the same
aquatic species. We should not forget the probability of many
fresh-water forms
species
having formerly ranged
as
as
continuously as fresh-water productions ever can range, over immense areas, and
then having
having subsequently
become extinct
at
in
intermediate
points.
regions.
But the wide distribution of fresh-water plants and of the lower animals, whether retaining the same identical form or in some degree modified, I believe mainly depends on the wide dispersal of their seeds and eggs by animals, more especially by fresh-water birds, which have
great
large
powers of flight, and naturally travel from one to another and often distant piece of water. Nature, like a careful gardener, thus takes her seeds from a bed of a particular nature, and drops them in another equally well fitted for them.
On
On
the
the
Inhabitants
Inhabitants
of
of
Oceanic
Oceanic
Islands .—
Islands .
Islands
We now come to the last of the three classes of facts, which I have selected as presenting the greatest amount