Various special difficulties also remain to be solved:
for instance, the occurrence, as shown by Dr. Hooker, of the same plants at points so enormously remote as Kerguelen Land, New Zealand, and Fuegia; but icebergs, as suggested by Lyell, may have been concerned in their dispersal. ↑3 blocks not present in 1869 1872; present in 1859 1860 1861 1866 | I have said that many difficulties remain to be solved: some of the most remarkable are stated with admirable clearness by Dr. Hooker in his botanical works on the antarctic regions.
These cannot be here discussed.
I will only say that
as far as regards the occurrence of identical species at points so enormously remote as Kerguelen Land, New Zealand, and Fuegia, I believe that towards the close of the Glacial period, icebergs, as suggested by Lyell, have been largely concerned in their dispersal.
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The existence The existence 1872 |
But the existence of several quite distinct species, belonging to genera exclusively confined to the south, 1859 1860 1861 1866 |
The existence, 1869 |
at these and other distant points of the southern hemisphere,
of species, which, though distinct, belong to genera exclusively confined to the south, is a of species, which, though distinct, belong to genera exclusively confined to the south, is a 1869 1872 |
is, on my theory of descent with modification, a far 1859 1860 1861 |
is, on the theory of descent with modification, a far 1866 |
more remarkable
case. case. 1869 1872 | case 1859 1860 1861 1866 |
....... 1869 1872 | of 1859 1860 1861 1866 |
....... 1869 1872 | difficulty. 1859 1860 1861 1866 |
....... 1869 1872 | For 1859 1860 1861 1866 |
Some Some 1869 1872 | some 1859 1860 1861 1866 |
of these species are so distinct, that we cannot suppose that there has been time since the commencement of the
last Glacial last Glacial 1869 1872 | Glacial 1859 1860 1861 1866 |
period for their
migration migration 1869 1872 | migration, 1859 1860 1861 1866 |
and
....... 1869 1872 | for their 1859 1860 1861 1866 |
subsequent modification to the necessary degree. The facts seem to
....... 1872 | me to 1859 1860 1861 1866 1869 |
indicate that
...OMIT 1869 1872 |
peculiar and very 1859 1860 1861 1866 |
distinct species
belonging to the same genera have belonging to the same genera have 1869 1872 |
have 1859 1860 1861 1866 |
migrated in radiating lines from
a a 1869 1872 | some 1859 1860 1861 1866 |
common centre; and I am inclined to look in the southern, as in the northern hemisphere, to a former and warmer period, before the commencement of the
last Glacial last Glacial 1872 | Glacial 1859 1860 1861 1866 1869 |
period, when the
Antarctic Antarctic 1869 1872 | antarctic 1859 1860 1861 1866 |
lands, now covered with ice, supported a highly peculiar
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