Comparison with 1869 |
|
various points of the southern hemisphere by occasional means of transport, and by the
aid, aid, 1859 1860 1861 1866 1869 | aid 1872 |
as halting-places, of existing and
now sunken islands,
and perhaps at the commencement of the Glacial period, by icebergs.
By these means, as I believe,
the southern shores of America, Australia,
and New Zealand, might have and New Zealand, might have 1869 |
New Zealand have 1859 |
New Zealand, have 1860 1861 |
and New Zealand, 1866 |
and New Zealand, may have 1872 |
become
slightly tinted by the same peculiar forms of vegetable
life. |
|
Sir C. Lyell in a striking passage has speculated, in language almost identical with mine, on the effects of great alternations of climate on
geographical distribution. And we have now seen that Mr.
Crolls
conclusion that successive Glacial periods in the one hemisphere
coincided coincided 1869 | coincide 1872 |
with warmer periods in the opposite hemisphere, together with the admission of the slow modification of species, explains a multitude of facts in the distribution of the same and of the allied forms of life in all parts of the globe. ↑1 blocks not present in 1869 1872; present in 1859 1860 1861 1866 | I believe that the world has recently felt one of his great cycles of change; and that on this view, combined with modification through natural selection, a multitude of facts in the present distribution both of the same and of allied forms of life can be explained.
|
The living waters may be said to
have flowed during
certain certain 1869 | one short 1859 1860 1861 1866 | one 1872 |
periods periods 1869 | period 1859 1860 1861 1866 1872 |
from the north and
afterwards from afterwards from 1869 |
from 1859 1860 1861 1866 |
during another from 1872 |
the south, and to have crossed at
the
equator; equator; 1859 1860 1861 1866 1869 | equator: 1872 |
but to have
flowed with greater force from the north
so as to have
freely inundated the south. As the tide leaves its drift in horizontal lines, though
rising higher on the shores where the tide rises highest, so have the living waters left their living drift on our
mountain-summits, mountain-summits, 1859 1860 1866 1869 |
mountain- summits, 1861 |
mountain summits, in 1872 |
in in 1859 1860 1861 1866 1869 | in 1872 |
a line gently rising from the arctic
lowlands to a great height
under the equator. The various beings thus left stranded may be compared with savage races of man, driven up and surviving in the
mountain-fastnesses mountain-fastnesses 1859 1860 1861 1866 1869 |
mountain fastnesses of 1872 |
of of 1859 1860 1861 1866 1869 | of 1872 |
almost every land, which serve as a record, full of interest to us, of the former inhabitants of the surrounding lowlands. |
CHAPTER
XII. XII. 1859 1860 1861 1866 1869 | XIII. 1872 |
|
GEOGRAPHICAL DISTRIBUTION—
continued.
continued.
1869 |
continued
.
1859 1860 1861 1866 1872 |
|
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.
|
Fresh-water
Productions
. |
As As 1866 1869 | AS 1859 1860 1861 1872 |
lakes and
river-systems river-systems 1859 1860 1861 1866 1869 | river systems 1872 |
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, 1866 1869 | and 1859 1860 1861 1872 |
as the sea is apparently a still more impassable
barrier, that they
never would never would 1859 1860 1861 1866 1869 | would never 1872 |
have extended to distant countries. But the case is exactly the reverse. Not only have many fresh-water species, belonging to
quite quite 1859 1860 1861 1866 1869 | quite 1872 |
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, 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 |
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 this power in 1859 1860 1861 1866 1869 |
the wide ranging power of 1872 |
fresh-water productions
of ranging widely, though so unexpected, of ranging widely, though so unexpected, 1859 1860 1861 1866 1869 |
OMIT 1872 |
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; 1859 1860 1861 1866 1869 | stream 1872 |
and and 1859 1860 1861 1866 1869 |
within their own countries; and 1872 |
liability to wide dispersal would follow from this capacity as an almost necessary consequence. We can here consider only a few
cases. cases. 1859 1860 1861 1866 1869 |
cases; of these, some of the most difficult to explain are presented by fish. 1872 |
|
Text in this page (from paragraph 200, sentence 210 to paragraph 200, sentence 240, word 9) is not present in 1869 |