| → bats. 1859 1860 1861 1866 1869 |
| bats, but is now believed to belong to the Insectivora. 1872 |
|
| → It has an 1859 1860 1861 1866 1869 |
| An 1872 |
|
| ↑ 1 blocks not present in 1859 1860 1861 1866 1869; present in 1872 |
| This flank-membrane is furnished with an extensor muscle.
|
|
| → I can see 1859 |
| I see 1860 1861 1866 |
| there is 1869 1872 |
|
| → had been formed by 1859 1860 1861 1866 1869 |
| was developed in 1872 |
|
| → case of the 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → convert it 1859 1860 1861 1866 1869 |
| have converted the animal 1872 |
|
| → bats which have 1859 1860 1861 1866 |
| certain bats which have 1869 |
| certain bats in which 1872 |
|
| → see 1859 1860 1861 1866 1872 |
| yet see actual 1869 |
|
| → or were unknown, 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
|
become modified, and all analogy would lead us to believe that some at least of the squirrels would decrease in numbers or become exterminated, unless they also became modified and improved in structure in a corresponding manner. Therefore, I can see no difficulty, more especially under changing conditions of life, in the continued preservation of individuals with fuller and fuller flank-membranes, each modification being useful, each being propagated,
by the accumulated effects of this process of natural selection, a perfect so-called flying squirrel was produced. |
|
| Now look at the Galeopithecus or
lemur, which formerly was
ranked amongst
→bats.
→It has an
extremely wide
from the corners of the jaw to the tail, and
the limbs
the elongated
↑
Although no graduated links of
fitted for gliding through the air, now connect the Galeopithecus with the other
yet
→I can see
no difficulty in supposing that such links formerly existed, and that each
→had been formed by
the same
as
the
→case of the
less perfectly gliding squirrels;
each grade of structure
useful to its possessor. Nor can I see any insuperable difficulty in further believing
that the
fingers and
of the Galeopithecus might
greatly lengthened by natural
and this, as far as the organs of flight are concerned, would
→convert it
into a bat. In
→bats which have
the wing-membrane
from the top of the shoulder to the
the hind-legs, we perhaps
→see
traces of an apparatus originally
for gliding through the air rather than for flight. |
|
| If about a dozen genera of birds
become
→or were unknown,
who would have ventured to
|
