which any great group of marine animals might be multiplied; and here they would remain confined, until some of the species became adapted to a cooler climate, and were enabled to double the
southern southern 1859 1860 1861 1866 1869 | Southern 1872 |
capes of Africa or Australia, and thus reach other and distant seas. |
|
From these
considerations, considerations, 1869 1872 |
and similar considerations, but chiefly 1859 1860 1861 1866 |
from our ignorance of the geology of other countries beyond the confines of Europe and the United
States, States, 1869 1872 | States; 1859 1860 1861 1866 |
and from the revolution in our palæontological
knowledge effected by knowledge effected by 1869 1872 |
ideas on many points, which 1859 1860 1861 1866 |
the discoveries of
....... 1869 1872 | even 1859 1860 1861 1866 |
the last dozen
years, years, 1869 1872 | years 1859 1860 1861 1866 |
....... 1869 1872 | have effected, 1859 1860 1861 1866 |
it seems to me to be about as rash
....... 1869 1872 | in us 1859 1860 1861 1866 |
to dogmatize on the succession of organic
forms forms 1869 1872 | beings 1859 1860 1861 1866 |
throughout the world, as it would be for a naturalist to land for five minutes on
a a 1869 1872 | some one 1859 1860 1861 1866 |
barren point in Australia, and then to discuss the number and range of its productions. |
On
On
1866 1869 1872 |
On
1859 1860 1861 |
the
the
1866 1869 1872 |
the
1859 1860 1861 |
sudden
sudden
1866 1869 1872 |
sudden
1859 1860 1861 |
Appearance
Appearance
1866 1869 1872 |
appearance
1859 1860 1861 |
of
of
1866 1869 1872 |
of
1859 1860 1861 |
Groups
Groups
1866 1869 1872 |
groups
1859 1860 1861 |
of
of
1866 1869 1872 |
of
1859 1860 1861 |
allied
allied
1866 1869 1872 |
Allied
1859 1860 |
allied
1861 |
Species
Species
1866 1869 1872 |
Species
1859 1860 1861 |
in
in
1866 1869 1872 |
in
1859 1860 1861 |
the
the
1866 1869 1872 |
the
1859 1860 1861 |
lowest
lowest
1866 1869 1872 |
lowest
1859 1860 1861 |
known
known
1866 1869 1872 |
known
1859 1860 1861 |
Fossiliferous
Fossiliferous
1866 1869 1872 |
fossiliferous
1859 1860 1861 |
Strata
.
Strata
. 1866 1869 1872 |
strata
.—
1859 1860 1861 |
|
There is another and allied difficulty, which is much
more serious. more serious. 1866 1869 1872 | graver. 1859 1860 1861 |
I allude to the manner in which
many species in several many species in several 1869 |
numbers of species 1859 1860 1861 1866 |
species belonging to several 1872 |
of the
main divisions of the animal kingdom main divisions of the animal kingdom 1869 1872 |
same group, 1859 1860 1861 |
same group 1866 |
suddenly appear in the lowest known fossiliferous rocks. Most of the arguments which have convinced me that all the existing species of the same group
are are 1869 1872 | have 1859 1860 1861 1866 |
descended from
a single a single 1869 1872 | one 1859 1860 1861 1866 |
progenitor, apply with
nearly nearly 1859 1860 1861 1866 1869 | nearly 1872 |
equal force to the earliest known species. For instance,
it it 1869 1872 | I 1859 1860 1861 1866 |
cannot
be doubted be doubted 1869 1872 | doubt 1859 1860 1861 1866 |
that all the
Silurian trilobites are Silurian trilobites are 1869 |
Silurian trilobites have 1859 1860 1861 1866 |
Cambrian and Silurian trilobites are 1872 |
descended from some one crustacean, which must have lived long before the
Silurian Silurian 1859 1860 1861 1866 1869 | Cambrian 1872 |
age, and which probably differed greatly from any known animal. Some of the most ancient
Silurian Silurian 1859 1860 1861 1866 1869 | Silurian 1872 |
animals, as the Nautilus, Lingula,
&c., &c., 1859 1860 1866 1869 1872 | &c, 1861 |
do not differ much from living species; and it cannot on
our our 1869 1872 | my 1859 1860 1861 1866 |
theory be supposed, that these old species were the progenitors of all the species
|