beings beings 1859 1860 1861 1866 | forms 1869 1872 |
throughout the world, as it would be for a naturalist to land for five minutes on
some one some one 1859 1860 1861 1866 | a 1869 1872 |
barren point in Australia, and then to discuss the number and range of its productions. |
On
On
1859 1860 1861 |
On
1866 1869 1872 |
the
the
1859 1860 1861 |
the
1866 1869 1872 |
sudden
sudden
1859 1860 1861 |
sudden
1866 1869 1872 |
appearance
appearance
1859 1860 1861 |
Appearance
1866 1869 1872 |
of
of
1859 1860 1861 |
of
1866 1869 1872 |
groups
groups
1859 1860 1861 |
Groups
1866 1869 1872 |
of
of
1859 1860 1861 |
of
1866 1869 1872 |
Allied
Allied
1859 1860 |
allied
1861 |
allied
1866 1869 1872 |
Species
Species
1859 1860 1861 |
Species
1866 1869 1872 |
in
in
1859 1860 1861 |
in
1866 1869 1872 |
the
the
1859 1860 1861 |
the
1866 1869 1872 |
lowest
lowest
1859 1860 1861 |
lowest
1866 1869 1872 |
known
known
1859 1860 1861 |
known
1866 1869 1872 |
fossiliferous
fossiliferous
1859 1860 1861 |
Fossiliferous
1866 1869 1872 |
strata
.—
strata
.—
1859 1860 1861 |
Strata
. 1866 1869 1872 |
|
There is another and allied difficulty, which is much
graver. graver. 1859 1860 1861 | more serious. 1866 1869 1872 |
I allude to the manner in which
numbers of species numbers of species 1859 1860 1861 1866 |
many species in several 1869 |
species belonging to several 1872 |
of the
same group, same group, 1859 1860 1861 |
same group 1866 |
main divisions of the animal kingdom 1869 1872 |
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
have have 1859 1860 1861 1866 | are 1869 1872 |
descended from
one one 1859 1860 1861 1866 | a single 1869 1872 |
progenitor, apply with
nearly nearly 1859 1860 1861 1866 1869 | nearly 1872 |
equal force to the earliest known species. For instance,
I I 1859 1860 1861 1866 | it 1869 1872 |
cannot
doubt doubt 1859 1860 1861 1866 | be doubted 1869 1872 |
that all the
Silurian trilobites have Silurian trilobites have 1859 1860 1861 1866 |
Silurian trilobites are 1869 |
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
my my 1859 1860 1861 1866 | our 1869 1872 |
theory be supposed, that these old species were the progenitors of all the species
of the orders to which they belong, of the orders to which they belong, 1859 1860 1861 |
belonging to the same group which have subsequently appeared, 1866 |
belonging to the same groups which have subsequently appeared, 1869 1872 |
for they
do do 1859 1860 1861 1866 | are 1869 1872 |
not
present characters present characters 1859 1860 1861 1866 | present characters 1869 1872 |
in any degree intermediate
between them. between them. 1859 1860 1861 1866 | in character. 1869 1872 |
If, moreover, they had been the progenitors of these orders, they would almost certainly have been long ago supplanted and exterminated by their numerous and improved descendants. |
|
Consequently, if
my my 1859 1860 1861 1866 | the 1869 1872 |
theory be true, it is indisputable
that that 1859 1860 1861 1872 | that, 1866 1869 |
before the lowest
Silurian Silurian 1859 1860 1861 1866 1869 | Cambrian 1872 |
stratum stratum 1859 1860 1861 1866 1872 |
or Cambrian stratum 1869 |
was
deposited, deposited, 1859 1860 1861 1866 1872 | deposited 1869 |
long periods elapsed, as long as, or probably far longer than, the whole interval from the
Silurian Silurian 1859 1860 1861 1866 | Cambrian 1869 1872 |
age to the present day; and that during these
vast, vast, 1859 1860 1861 1866 | vast 1869 1872 |
yet quite unknown, periods of time, yet quite unknown, periods of time, 1859 1860 1861 1866 |
periods 1869 1872 |
the world swarmed with living creatures.
|