| → are 1859 1860 |
| of a genus ever 1861 1866 1869 1872 |
|
| → at any one period; and all changes are slowly effected. 1859 1860 |
| the other species becoming utterly extinct and leaving no modified progeny. 1861 1866 1869 1872 |
|
| ↑ 1 blocks not present in 1859 1860; present in 1861 1866 1869 1872 |
| Of the species which do change, only a few within the same country change at the same time; and all modifications are slowly effected.
|
|
| → certainly they 1859 1860 1861 1866 |
| this appearance is 1869 1872 |
|
| → Why do we not find great piles of strata beneath the Silurian system, stored with the remains 1859 1860 1861 |
| Although we now know that organic beings appeared on this globe, at a period incalculably remote, long before the lowest bed 1866 1869 1872 |
|
| → progenitors 1859 1860 1861 |
| Silurian system was deposited, why do we not find beneath this system great piles of strata stored with the remains 1866 |
| Cambrian system was deposited, why do we not find beneath this system great piles of strata stored with the remains 1869 1872 |
|
| → Silurian groups of 1859 1860 1861 |
| progenitors of the Silurian 1866 |
| progenitors of the Cambrian 1869 1872 |
|
|
links between them, but only between each and some extinct and supplanted form. Even on a wide area, which has during a long period remained continuous, and of which the
and other conditions of life change insensibly in
from a district occupied by one species into another district occupied by a closely allied species, we have no just right to expect often to find intermediate varieties in the intermediate
For we have reason to believe that only a few species
→are
→at any one period; and all changes are slowly effected.
↑
I have also shown that the intermediate varieties which
at first
in the intermediate zones,
be liable to be supplanted by the allied forms on either hand;
the latter, from existing in greater numbers,
generally be modified and improved at a quicker rate than the intermediate varieties, which
in lesser numbers; so that the intermediate varieties
in the long run, be supplanted and exterminated. |
|
| On this doctrine of the extermination of an infinitude of connecting links, between the living and extinct inhabitants of the world, and at each successive period between the extinct and still older species, why is not every geological formation charged with such links? Why does not every collection of fossil remains afford plain evidence of the
and mutation of the forms of life?
We meet with no such evidence, and this is the most obvious and forcible of the many objections which may be urged against my theory. Why, again, do whole groups of allied species appear, though
→certainly they
often
to have come in suddenly on the
geological stages?
→Why do we not find great piles of strata beneath the Silurian system, stored with the remains
of the
→progenitors
of the
→Silurian groups of
fossils? For
on
such
|
