in in 1859 1860 1861 1866 1869 | to 1872 |
an extreme degree, then
the the 1866 1869 1872 | such 1859 1860 1861 |
facts, facts, 1866 1869 1872 | facts 1859 1860 1861 |
which which 1866 1869 1872 | as 1859 1860 1861 |
the record
does give, strongly does give, strongly 1866 1869 1872 |
gives, 1859 1860 |
gives 1861 |
support the theory of descent with modification. New species have come on the stage slowly and at successive intervals; and the amount of change, after equal intervals of time, is widely different in different groups. The extinction of species and of whole groups of species, which has played so conspicuous a part in the history of the organic world, almost inevitably follows
from from 1869 1872 | on 1859 1860 1861 1866 |
the principle of natural selection; for old forms
are are 1869 1872 | will be 1859 1860 1861 1866 |
supplanted by new and improved forms. Neither single species nor groups of species
reappear reappear 1859 1860 1861 1866 1869 | re-appear 1872 |
when the chain of ordinary generation
is is 1869 1872 | has 1859 1860 1861 1866 |
once
....... 1869 1872 | been 1859 1860 1861 1866 |
broken. The gradual diffusion of dominant
forms, forms, 1859 1860 1861 1869 1872 | forms 1866 |
with the slow modification of their descendants, causes the forms of life, after long intervals of time, to appear as if they had changed simultaneously throughout the world. The fact of the fossil remains of each formation being in some degree intermediate in character between the fossils in the
formations formations 1859 1860 1861 1869 1872 | formation 1866 |
above and below, is simply explained by their intermediate position in the chain of descent. The grand fact that all extinct
....... 1869 1872 | organic 1859 1860 1861 1866 |
beings
can be classed with all can be classed with all 1869 1872 |
belong to the same system with 1859 1860 1861 1866 |
recent beings,
naturally naturally 1869 1872 |
falling either into the same or into intermediate groups, 1859 1860 1861 1866 |
follows from the living and the extinct being the
offspring offspring 1859 1860 1866 1869 1872 | off-spring 1861 |
of common parents. As
species species 1869 1872 |
the groups which have descended from an ancient progenitor 1859 1860 1861 1866 |
have generally diverged in
character character 1869 1872 | character, 1859 1860 1861 1866 |
during their long course of descent and modification, during their long course of descent and modification, 1869 1872 |
the progenitor with its early descendants will often be intermediate in character in comparison with its later descendants; and thus 1859 1860 1861 1866 |
we can
understand understand 1869 1872 | see 1859 1860 1861 1866 |
why
it is that the it is that the 1869 1872 |
the 1859 1860 1861 1866 |
more ancient
forms, or early progenitors of each group, so often occupy a position forms, or early progenitors of each group, so often occupy a position 1869 1872 |
a fossil is, the oftener it stands 1859 1860 1861 1866 |
in some degree intermediate between existing
....... 1869 1872 | and allied 1859 1860 1861 | allied 1866 |
groups. Recent forms are generally looked
at at 1859 1860 1861 1866 1869 | upon 1872 |
as being,
on the whole, higher in the scale of organisation on the whole, higher in the scale of organisation 1869 1872 |
in some vague sense, higher 1859 1860 |
on the whole, higher 1861 1866 |
than ancient
....... 1869 1872 | and extinct 1859 1860 1861 1866 |
forms; and they
must be higher, must be higher, 1869 1872 |
are 1859 1860 1861 1866 |
in so far in so far 1869 1872 |
in so far higher 1859 1860 1861 |
higher in so far 1866 |
as the later and more improved forms have conquered the older and less improved
forms forms 1869 1872 | organic beings 1859 1860 1861 1866 |
in the struggle for
life; they have also generally had their organs more specialized for different functions. life; they have also generally had their organs more specialized for different functions. 1869 |
life. 1859 1860 |
life; they will also generally have had their organs more specialised for different functions. 1861 1866 |
life; they have also generally had their organs more specialised for different functions. 1872 |
|