Comparison with 1872 |
|
nor disappearance of
the the 1869 1872 | their 1859 1860 1861 1866 |
many
species embedded in each formation species embedded in each formation 1872 |
now extinct species 1859 1860 1861 1866 |
extinct species 1869 |
has been simultaneous. has been simultaneous. 1872 |
has been simultaneous 1859 1860 1861 1866 |
embedded 1869 |
....... 1872 | in 1859 1860 1861 1866 1869 |
....... 1872 | each 1859 1860 1861 1866 1869 |
....... 1872 | separate 1859 1860 1861 1866 | OMIT 1869 |
...OMIT 1872 |
formation. 1859 1860 1861 1866 |
formation has been simultaneous. 1869 |
|
|
Species
belonging to belonging to 1872 | of 1859 1860 1861 1866 1869 |
different genera and classes have not changed at the same rate, or in the same degree. In the
older older 1861 1866 1869 1872 | oldest 1859 1860 |
tertiary beds a few living shells may still be found in the midst of a multitude of extinct forms. Falconer has given a striking instance of a similar fact,
for for 1869 1872 | in 1859 1860 1861 1866 |
an existing crocodile
is associated is associated 1869 1872 | associated 1859 1860 1861 1866 |
with many
....... 1869 1872 | strange and 1859 1860 | strange 1861 1866 |
lost mammals and reptiles in the sub-Himalayan deposits. The Silurian Lingula differs but little from the living species of this genus; whereas most of the other Silurian Molluscs and all the Crustaceans have changed greatly. The productions of the land seem to
have changed have changed 1872 | change 1859 1860 1861 1866 1869 |
at a quicker rate than those of the sea, of which a striking instance has
....... 1872 | lately 1859 1860 1861 1866 1869 |
been observed in Switzerland. There is some reason to believe that
organisms organisms 1866 1869 1872 | organisms, 1859 1860 1861 |
....... 1869 1872 | considered 1859 1860 1861 1866 |
high in the
scale, scale, 1869 1872 | scale 1859 1860 1861 1866 |
....... 1869 1872 | of nature, 1859 1860 1861 1866 |
change more quickly than those that are low: though there are exceptions to this rule. The amount of organic change, as Pictet has remarked,
is is 1869 1872 | does 1859 1860 1861 1866 |
not
...OMIT 1869 1872 |
strictly correspond with the succession of our geological formations; so that between each two consecutive formations, the forms of life have seldom changed in exactly 1859 1860 1861 1866 |
the same
in each successive so-called formation. in each successive so-called formation. 1869 1872 |
degree. 1859 1860 1861 1866 |
Yet if we compare any but the most closely related formations, all the species will be found to have undergone some change. When a species has once disappeared from the face of the earth, we have
no reason no reason 1861 1866 1869 1872 | reason 1859 1860 |
to believe that the same identical form
ever ever 1861 1866 1869 1872 | never 1859 1860 |
reappears. The strongest apparent exception to this latter
rule rule 1866 1869 1872 | rule, 1859 1860 1861 |
is that of the so-called "colonies" of M. Barrande, which intrude for a period in the midst of an older formation, and then allow the pre-existing fauna to reappear; but Lyell's
explanation, namely, that it is a case of temporary migration from a distinct geographical province, seems
....... 1872 | to me 1859 1860 1861 1866 1869 |
satisfactory.
|
nor disappearance of
their their 1859 1860 1861 1866 | the 1869 1872 |
many
now extinct species now extinct species 1859 1860 1861 1866 |
extinct species 1869 |
species embedded in each formation 1872 |
has been simultaneous has been simultaneous 1859 1860 1861 1866 |
embedded 1869 |
has been simultaneous. 1872 |
in in 1859 1860 1861 1866 1869 | in 1872 |
each each 1859 1860 1861 1866 1869 | each 1872 |
separate separate 1859 1860 1861 1866 | separate 1869 | separate 1872 |
formation. formation. 1859 1860 1861 1866 |
formation has been simultaneous. 1869 |
OMIT 1872 |
|
|
Species
of of 1859 1860 1861 1866 1869 | belonging to 1872 |
different genera and classes have not changed at the same rate, or in the same degree. In the
oldest oldest 1859 1860 | older 1861 1866 1869 1872 |
tertiary beds a few living shells may still be found in the midst of a multitude of extinct forms. Falconer has given a striking instance of a similar fact,
in in 1859 1860 1861 1866 | for 1869 1872 |
an existing crocodile
associated associated 1859 1860 1861 1866 | is associated 1869 1872 |
with many
strange and strange and 1859 1860 | strange 1861 1866 | strange and 1869 1872 |
lost mammals and reptiles in the sub-Himalayan deposits. The Silurian Lingula differs but little from the living species of this genus; whereas most of the other Silurian Molluscs and all the Crustaceans have changed greatly. The productions of the land seem to
change change 1859 1860 1861 1866 1869 | have changed 1872 |
at a quicker rate than those of the sea, of which a striking instance has
lately lately 1859 1860 1861 1866 1869 | lately 1872 |
been observed in Switzerland. There is some reason to believe that
organisms, organisms, 1859 1860 1861 | organisms 1866 1869 1872 |
considered considered 1859 1860 1861 1866 | considered 1869 1872 |
high in the
scale scale 1859 1860 1861 1866 | scale, 1869 1872 |
of nature, of nature, 1859 1860 1861 1866 | of nature, 1869 1872 |
change more quickly than those that are low: though there are exceptions to this rule. The amount of organic change, as Pictet has remarked,
does does 1859 1860 1861 1866 | is 1869 1872 |
not
strictly correspond with the succession of our geological formations; so that between each two consecutive formations, the forms of life have seldom changed in exactly strictly correspond with the succession of our geological formations; so that between each two consecutive formations, the forms of life have seldom changed in exactly 1859 1860 1861 1866 |
OMIT 1869 1872 |
the same
degree. degree. 1859 1860 1861 1866 |
in each successive so-called formation. 1869 1872 |
Yet if we compare any but the most closely related formations, all the species will be found to have undergone some change. When a species has once disappeared from the face of the earth, we have
reason reason 1859 1860 | no reason 1861 1866 1869 1872 |
to believe that the same identical form
never never 1859 1860 | ever 1861 1866 1869 1872 |
reappears. The strongest apparent exception to this latter
rule, rule, 1859 1860 1861 | rule 1866 1869 1872 |
is that of the so-called "colonies" of M. Barrande, which intrude for a period in the midst of an older formation, and then allow the pre-existing fauna to reappear; but
Lyell's Lyell's 1859 1861 1866 1872 | Lyells 1860 1869 |
explanation, namely, that it is a case of temporary migration from a distinct geographical province, seems
to me to me 1859 1860 1861 1866 1869 | to me 1872 |
satisfactory.
|