| → can 1869 1872 |
| in the Old World could 1859 1860 |
| in the Old World can 1861 1866 |
|
| → OMIT 1869 1872 |
| hotter than any 1859 1860 1861 1866 |
|
| → hotter than any in the New World, but 1869 |
| yet 1859 1860 1861 1866 |
| hotter than any in the New World; but 1872 |
|
| → different from that of the surrounding districts; for it is very rare to find a group of organisms confined to a small area, having conditions peculiar in only a slight degree. 1869 |
| or flora. 1859 1860 1861 1866 |
| different from that of the surrounding districts; for it is rare to find a group of organisms confined to a small area, of which the conditions are peculiar in only a slight degree. 1872 |
|
| → are separated by a space of ten degrees of latitude and are exposed to 1869 1872 |
| inhabit a 1859 1860 1861 |
| are separated by a space of ten degrees of latitude and live under a 1866 |
|
| → conditions, yet they are 1869 |
| climate, and they will be found 1859 1860 1861 |
| climate, yet they are 1866 |
| conditions; yet they are 1872 |
|
| → climate. 1860 1861 1866 1869 1872 |
| climate. Analogous facts could be given with respect to the inhabitants of the sea. 1859 |
|
|
small areas
→can
be pointed out
→OMIT
in the
→hotter than any in the New World, but
these are not inhabited by a
fauna
→different from that of the surrounding districts; for it is very rare to find a group of organisms confined to a small area, having conditions peculiar in only a slight degree. Notwithstanding this
in the conditions of the Old and New Worlds, how widely different are their living productions! |
|
| In the southern hemisphere, if we compare large tracts of land in Australia, South Africa, and western South America, between latitudes
and
we shall find parts extremely similar in all their conditions, yet it would not be possible to point out three faunas and floras more utterly dissimilar.
we may compare the productions of South America south of lat.
with those north of
which consequently
→are separated by a space of ten degrees of latitude and are exposed to
considerably different
→conditions, yet they are
incomparably more closely related to each
than they are to the productions of Australia or Africa under nearly the same
→climate. Analogous facts could be given with respect to the inhabitants of the sea. |
|
| A second great fact which strikes us in our general review is, that barriers of any kind, or obstacles to free migration, are related in a close and important manner to the differences between the productions of various regions. We see this in the great difference
nearly all the terrestrial productions of the New and Old Worlds, excepting in the northern parts, where the land almost joins, and where, under a slightly different climate, there might have been free migration for the northern temperate forms, as there now is for the strictly arctic productions. We see the same fact in the great difference between the inhabitants of Australia, Africa, and South America under the same
for these countries are almost as much isolated
|
