will will 1859 1860 1861 1866 1869 | would 1872 |
be liable to
be be 1859 1860 1861 | be 1866 1869 1872 |
exterminated. exterminated. 1859 1860 1861 | extermination. 1866 1869 1872 |
Hence we
can can 1859 1860 1861 1866 | can 1869 1872 |
see why all the species in the same region do at last, if we look to
wide wide 1859 1860 1861 1866 | long 1869 1872 |
enough intervals of time, become
modified; modified; 1859 1860 | modified, 1861 1866 1869 1872 |
for
those which do not change will those which do not change will 1859 1860 1861 1866 |
otherwise they would 1869 1872 |
become extinct. |
|
In members of the same class the average amount of change, during long and equal periods of time, may, perhaps, be nearly the same; but as the accumulation of
long-enduring fossiliferous formations long-enduring fossiliferous formations 1859 1860 1861 1866 |
long-enduring formations, 1869 |
enduring formations, rich in fossils, 1872 |
depends depends 1859 1860 1861 1866 1872 |
rich in fossils, depends 1869 |
on great masses of sediment
having been having been 1859 1860 1861 1866 | being 1869 1872 |
deposited on
areas whilst subsiding, areas whilst subsiding, 1859 1860 1861 1866 |
subsiding areas, 1869 1872 |
our formations have been almost necessarily accumulated at wide and irregularly intermittent
intervals; intervals; 1859 1860 1861 | intervals 1866 1869 1872 |
consequently consequently 1859 1860 1861 |
of time; consequently 1866 1869 1872 |
the amount of organic change exhibited by the fossils embedded in consecutive formations is not equal. Each formation, on this view, does not mark a new and complete act of creation, but only an occasional scene, taken almost at hazard, in
a a 1859 1860 1861 | an ever 1866 1869 1872 |
slowly changing drama. |
|
We can clearly understand why a species when once lost should never reappear, even if the very same conditions of life, organic and inorganic, should recur. For though the offspring of one species might be adapted (and no doubt this has occurred in innumerable instances) to fill the
exact exact 1859 1860 1861 1866 | exact 1869 1872 |
place of another species in the economy of nature, and thus supplant it; yet the two forms— the old and the new— would not be identically the same; for both would almost certainly inherit different characters from their distinct
progenitors. progenitors. 1859 1860 1861 1866 |
progenitors, and organisms already differing would vary in a different manner. 1869 |
progenitors; and organisms already differing would vary in a different manner. 1872 |
For instance, it is
just just 1859 1860 1861 1866 1869 | just 1872 |
possible, if
our fantail-pigeons were all our fantail-pigeons were all 1859 1860 1861 1866 |
all our fantail pigeons were 1869 1872 |
destroyed, that
fanciers, fanciers, 1859 1860 1861 1866 | fanciers 1869 1872 |
by striving during long ages for the same object, by striving during long ages for the same object, 1859 1860 1861 1866 |
OMIT 1869 1872 |
might make a new breed hardly distinguishable from
our our 1859 1860 1861 1866 | the 1869 1872 |
present
fantail; fantail; 1859 1860 1861 1866 | breed; 1869 1872 |
but if the parent rock-pigeon were
also also 1859 1860 1861 1866 | likewise 1869 1872 |
destroyed, and
in in 1859 1860 1861 1866 | under 1869 1872 |
nature we have every reason to believe that
the the 1859 1860 1861 1866 | the 1869 1872 |
parent-form parent-form 1859 1860 1861 1866 | parent-forms 1869 1872 |
will will 1859 1860 1861 1866 | are 1869 1872 |
generally
be be 1859 1860 1861 1866 | be 1869 1872 |
supplanted and
|