Comparison with 1866 |
|
in all points of structure. So that we might obtain the parent-species and its several modified descendants from the lower and upper beds of
a a 1859 1860 1861 1866 | the same 1869 1872 |
formation, and unless we obtained numerous transitional gradations, we should not recognise their relationship,
and should consequently be compelled to
rank them
all all 1859 1860 1861 1866 | all 1869 1872 |
as distinct species. |
|
It is notorious on what excessively slight differences many palæontologists have founded their species; and they do this the more readily if the specimens come from different sub-stages of the same formation. Some experienced conchologists are now sinking many of the very fine species of
D'Orbigny D'Orbigny 1859 1860 1861 1866 1872 | D''Orbigny 1869 |
and others into the rank of varieties; and on this view we do find the kind of evidence of change which on
my my 1859 1860 1861 1866 | the 1869 1872 |
theory we ought to find. Look again at the later tertiary deposits, which include many shells believed by the majority of naturalists to be identical with existing species; but some excellent naturalists, as Agassiz and Pictet, maintain that all these tertiary species are specifically distinct, though the distinction is admitted to be very slight; so that here, unless we believe that these eminent naturalists have been misled by their imaginations
and that these late tertiary species really present no difference whatever from their living representatives, or unless we
believe that the great majority of naturalists are wrong and that that the believe that the great majority of naturalists are wrong and that that the 1866 |
believe that the great majority of naturalists are wrong and that the 1861 1869 |
admit, in opposition to the judgment of most naturalists, that these 1872 |
tertiary species are all truly distinct from the recent, we have evidence of
frequent occurrence of frequent occurrence of 1866 |
a very general 1861 |
the frequent occurrence of 1869 1872 |
slight modification
of form of
the kind required. Moreover, if
we look to rather wider intervals,
namely,
to distinct but consecutive stages of the same great formation, we find that the embedded fossils, though almost
universally ranked as specifically different, yet are far more closely allied
to each other than are the species found in more widely separated formations;
so that here again we have undoubted evidence of change, though not strictly of variation, so that here again we have undoubted evidence of change, though not strictly of variation, 1861 1866 |
but to this subject I shall have to return 1859 1860 |
so that here again we have undoubted evidence of change 1869 1872 |
|
in all
respects. respects. 1866 1869 1872 |
points of structure. 1859 1860 1861 |
So that we might obtain the parent-species and its several modified descendants from the lower and upper beds of
the same the same 1869 1872 | a 1859 1860 1861 1866 |
formation, and unless we obtained numerous transitional gradations, we should not recognise their
blood-relationship, blood-relationship, 1861 1866 1869 1872 | relationship, 1859 1860 |
and should consequently
be compelled to be compelled to 1859 1860 1861 1866 1869 |
OMIT 1872 |
rank them
....... 1869 1872 | all 1859 1860 1861 1866 |
as distinct species. |
|
It is notorious on what excessively slight differences many palæontologists have founded their species; and they do this the more readily if the specimens come from different sub-stages of the same formation. Some experienced conchologists are now sinking many of the very fine species of
D''Orbigny D''Orbigny 1869 | D'Orbigny 1859 1860 1861 1866 1872 |
and others into the rank of varieties; and on this view we do find the kind of evidence of change which on
the the 1869 1872 | my 1859 1860 1861 1866 |
theory we ought to find. Look again at the later tertiary deposits, which include many shells believed by the majority of naturalists to be identical with existing species; but some excellent naturalists, as Agassiz and Pictet, maintain that all these tertiary species are specifically distinct, though the distinction is admitted to be very slight; so that here, unless we believe that these eminent naturalists have been misled by their
imaginations, imaginations, 1866 1869 1872 | imaginations 1861 |
and that these late tertiary species really present no difference whatever from their living representatives, or unless we
believe that the great majority of naturalists are wrong and that the believe that the great majority of naturalists are wrong and that the 1861 1869 |
believe that the great majority of naturalists are wrong and that that the 1866 |
admit, in opposition to the judgment of most naturalists, that these 1872 |
tertiary species are all truly distinct from the recent, we have evidence of
the frequent occurrence of the frequent occurrence of 1869 1872 |
a very general 1861 |
frequent occurrence of 1866 |
slight
modifications modifications 1866 1869 1872 | modification 1861 |
of
....... 1866 1869 1872 | form of 1861 |
the kind required.
If If 1861 1866 1869 1872 | Moreover, if 1859 1860 |
we look to rather wider
intervals intervals 1861 1866 1869 1872 | intervals, 1859 1860 |
of time, namely, of time, namely, 1861 1866 1869 1872 |
namely, 1859 1860 |
to distinct but consecutive stages of the same great formation, we find that the embedded fossils, though
almost almost 1859 1860 1861 1866 1869 | almost 1872 |
universally ranked as specifically different, yet are far more closely
related related 1861 1866 1869 1872 | allied 1859 1860 |
to each other than are the species found in more widely separated formations;
so that here again we have undoubted evidence of change so that here again we have undoubted evidence of change 1869 1872 |
but to this subject I shall have to return 1859 1860 |
so that here again we have undoubted evidence of change, though not strictly of variation, 1861 1866 |
|