fairly be attributed to our not having as yet discovered in an intermediate deposit
certain certain 1869 1872 | the 1859 1860 1861 1866 |
forms which are
....... 1869 1872 | therein 1859 1860 1861 1866 |
absent absent 1869 1872 | absent, 1859 1860 1861 1866 |
in it, but in it, but 1869 1872 |
but 1859 1860 1861 1866 |
which occur
both above both above 1866 1869 1872 | above 1859 1860 1861 |
and below: so in space, it certainly is the general rule that the area inhabited by a single species, or by a group of species, is
continuous, continuous, 1869 1872 | continuous; 1859 1860 1861 1866 |
and the exceptions, which are not rare, may, as I have attempted to show, be accounted for by
former migrations former migrations 1866 1869 1872 |
migration at some former period 1859 1860 1861 |
under different
circumstances, circumstances, 1869 1872 | conditions 1859 1860 1861 1866 |
or
through through 1866 1869 1872 | by 1859 1860 1861 |
occasional means of transport,
or or 1866 1869 1872 | and 1859 1860 1861 |
by the species having become extinct in the intermediate tracts. Both in time and space, species and groups of species have their points of maximum development. Groups of species,
living during the same living during the same 1866 1869 1872 |
belonging either to a certain 1859 1860 1861 |
period of time, or
living within the same living within the same 1866 1869 1872 |
to a certain 1859 1860 1861 |
area, are often characterised by trifling
features features 1866 1869 1872 | characters 1859 1860 1861 |
in common, as of sculpture or colour. In looking to the long succession of
past ages, past ages, 1866 1869 1872 | ages, 1859 1860 1861 |
as in
....... 1872 | now 1859 1860 1861 1866 1869 |
looking to distant provinces throughout the world, we find that
species in certain classes species in certain classes 1869 1872 |
some organisms 1859 1860 1861 |
certain organisms 1866 |
differ
little little 1866 1869 1872 | little, 1859 1860 1861 |
from each other, whilst those in another from each other, whilst those in another 1872 |
whilst others belonging to a different 1859 1860 1861 |
from each other, whilst others belonging to a different 1866 |
from each other, whilst others in a different 1869 |
class, or
only in only in 1869 1872 | to 1859 1860 1861 1866 |
a different
section section 1872 |
order, or even only to a different family 1859 1860 1861 |
order, or only to a different family 1866 |
family 1869 |
of the same order, differ
greatly from each other. greatly from each other. 1866 1869 1872 |
greatly. 1859 1860 1861 |
In both time and space the
lowly organised lowly organised 1866 1869 1872 | lower 1859 1860 1861 |
members of each class generally change less than the
highly organised; highly organised; 1866 1869 1872 | higher; 1859 1860 1861 |
but there are in both cases marked exceptions to the rule.
According to our According to our 1869 1872 |
On my 1859 1860 1861 1866 |
theory, theory, 1872 | theory 1859 1860 1861 1866 1869 |
these several relations throughout time and space are intelligible; for whether we look to the
allied forms allied forms 1872 | forms 1859 1860 1861 1866 1869 |
of life which have changed during successive
ages, ages, 1869 1872 | ages 1859 1860 1861 1866 |
...OMIT 1869 1872 |
within the same quarter of the world, 1859 1860 1861 1866 |
or to those which have changed after having migrated into distant quarters, in both cases
they they 1872 | the 1859 1860 1861 1866 1869 |
are are 1872 |
forms within each class have been 1859 1860 1861 |
forms within each class are 1866 1869 |
connected by the same bond of ordinary generation;
...OMIT 1872 |
and the more nearly any two forms are related in blood, the nearer they will generally stand to each other in time and space; 1859 1860 1861 |
and 1866 1869 |
in both cases the laws of variation have been the same, and modifications have been accumulated by the same
means means 1869 1872 | power 1859 1860 1861 1866 |
of natural selection.
|