Comparison with 1866 |
|
connected all the past and present species of the same group into one long and branching chain of life. We ought only to look for a few links, some more closely,
some more distantly
related
to each other; and these links, let them be ever so close, if found in different stages of the same formation, would, by most
palæonto- logists,
be ranked as distinct species. But I do not pretend that I should ever have suspected how poor a record of the mutations of life,
the best
preserved preserved 1859 1860 1866 1869 1872 | pre-served 1861 |
geological section
would present, would present, 1866 | presented, 1859 1860 1861 | would present, 1869 1872 |
had not the difficulty
of our not discovering
innumerable transitional links between the species which appeared
at the commencement and close of each formation, pressed so hardly on my theory. |
On
On
1866 1869 1872 |
On
1859 1860 1861 |
the
the
1866 1869 1872 |
the
1859 1860 1861 |
sudden
sudden
1866 1869 1872 |
sudden
1859 1860 1861 |
Appearance
Appearance
1866 1869 1872 |
appearance
1859 1860 1861 |
of
of
1866 1869 1872 |
of
1859 1860 1861 |
whole
whole
1866 1869 1872 |
whole
1859 1860 1861 |
Groups
Groups
1866 1869 1872 |
groups
1859 1860 1861 |
of
of
1866 1869 1872 |
of
1859 1860 1861 |
allied
allied
1866 1869 1872 |
Allied
1859 1860 |
allied
1861 |
Species
.
Species
. 1866 1869 1872 |
Species
.—
1859 1860 1861 |
|
The abrupt manner in which whole groups of species suddenly appear in certain formations, has been urged by several palæontologists,
for instance, by Agassiz, Pictet, and by none more forcibly than by Professor Sedgwick,
as a fatal objection to the belief in the transmutation of species. If numerous species, belonging to the same genera or families, have really started into life all
at once, the fact would be fatal to the theory of descent with slow modification
through natural selection. For the development of
a group of forms, all of which have
descended from some one progenitor, must have been an extremely slow process; and the progenitors
must have lived long ages
before their modified descendants. But we continually
overrate overrate 1866 1869 1872 | over-rate 1859 1860 1861 |
the perfection of the geological record, and falsely infer, because certain genera or families have not been found beneath a certain stage, that they did not exist before that stage. In all cases positive palæontological evidence may be implicitly trusted; negative evidence is worthless, as experience has so often shown. We
|
connected all the past and present species of the same group into one long and branching chain of life. We ought only to look for a few links,
and such assuredly we do find— and such assuredly we do find— 1861 1866 1869 1872 |
some more closely, 1859 1860 |
some more
distantly, distantly, 1861 1866 1869 1872 | distantly 1859 1860 |
some more closely, related some more closely, related 1861 1866 1869 1872 |
related 1859 1860 |
to each other; and these links, let them be ever so close, if found in different stages of the same formation, would, by
many many 1861 1866 1869 1872 | most 1859 1860 |
palæontologists, palæontologists, 1860 1861 1866 1869 1872 | palæonto- logists, 1859 |
be ranked as distinct species. But I do not pretend that I should ever have suspected how poor
a record of the mutations of life a record of the mutations of life 1861 1866 |
a record of the mutations of life, 1859 1860 |
was the record in 1869 1872 |
the best
pre-served pre-served 1861 | preserved 1859 1860 1866 1869 1872 |
geological
section section 1859 1860 1861 1866 | sections, 1869 1872 |
presented, presented, 1859 1860 1861 | would present, 1866 | presented, 1869 1872 |
had not the
difficulty difficulty 1859 1860 1861 1866 | absence 1869 1872 |
of
our not discovering our not discovering 1859 1860 1861 1866 |
OMIT 1869 1872 |
innumerable transitional links between the species which
appeared appeared 1859 1860 1861 1866 | lived 1869 1872 |
at the commencement and close of each formation, pressed so hardly on my theory. |
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 |
whole
whole
1859 1860 1861 |
whole
1866 1869 1872 |
groups
groups
1859 1860 1861 |
Groups
1866 1869 1872 |
of
of
1859 1860 1861 |
of
1866 1869 1872 |
allied
allied
1861 |
Allied
1859 1860 |
allied
1866 1869 1872 |
Species
.—
Species
.—
1859 1860 1861 |
Species
. 1866 1869 1872 |
|
The abrupt manner in which whole groups of species suddenly appear in certain formations, has been urged by several
palæontologists— palæontologists— 1860 1861 1866 1869 1872 | palæontologists, 1859 |
for instance, by Agassiz, Pictet, and
Sedgwick— Sedgwick— 1861 1866 1869 1872 |
by none more forcibly than by Professor Sedgwick, 1859 |
by none more forcibly than by Professor Sedgwick— 1860 |
as a fatal objection to the belief in the transmutation of species. If numerous species, belonging to the same genera or families, have really started into life
....... 1861 1866 1869 1872 | all 1859 1860 |
at once, the fact would be fatal to the theory of
descent with slow modification descent with slow modification 1859 1860 1861 1866 1869 |
evolution 1872 |
through natural selection. For the development
of of 1859 1860 1861 1866 1869 |
by this means of 1872 |
a group of forms, all of which
have have 1859 1860 1861 1866 1869 | are 1872 |
descended from some one progenitor, must have been an extremely slow process; and the
progenitors progenitors 1859 1860 1861 1866 1872 | progenitors, 1869 |
must have lived long
ages ages 1859 1860 1861 1866 1869 | ages 1872 |
before their modified descendants. But we continually
over-rate over-rate 1859 1860 1861 | overrate 1866 1869 1872 |
the perfection of the geological record, and falsely infer, because certain genera or families have not been found beneath a certain stage, that they did not exist before that stage. In all cases positive palæontological evidence may be implicitly trusted; negative evidence is worthless, as experience has so often shown. We
|