See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1861
1866
1872

I well remember, when first collecting in the fresh waters of Brazil, 1859 1860 1861 1866 1869
When first collecting in the fresh waters of Brazil, I well remember 1872

this power in 1859 1860 1861 1866 1869
the wide ranging power of 1872

of ranging widely, though so unexpected, 1859 1860 1861 1866 1869
OMIT 1872

and 1859 1860 1861 1866 1869
within their own countries; and 1872

CHAPTER
XIII.
XII.
GEOGRAPHICAL DISTRIBUTION—
continued .
continued.
Distribution of fresh-water productions— On the inhabitants of oceanic islands— Absence of Batrachians and of terrestrial Mammals— On the relation of the inhabitants of islands to those of the nearest mainland— On colonisation from the nearest source with subsequent modification— Summary of the last and present
chapters.
chapter.
Fresh-water
Fresh-water
Productions.
Productions .
AS
As
lakes and
river systems
river-systems
are separated from each other by barriers of land, it might have been thought that fresh-water productions would not have ranged widely within the same country,
and
and,
as the sea is apparently a still more
impassable
formidable
barrier, that they
would never
never would
have extended to distant countries. But the case is exactly the reverse. Not only have many fresh-water species, belonging to
quite
quite
different classes, an enormous range, but allied species prevail in a remarkable manner throughout the world. I well remember, when first collecting in the fresh waters of Brazil, feeling much surprise at the similarity of the fresh-water insects, shells, &c., and at the dissimilarity of the surrounding terrestrial beings, compared with those of Britain.
But this power in fresh-water productions of ranging widely, though so unexpected, can, I think, in most cases be explained by their having become fitted, in a manner highly useful to them, for short and frequent migrations from pond to pond, or from stream to
stream
stream;
and liability to wide dispersal would follow