Comparison with 1860 |
|
fitted for gliding through the air, now connect the Galeopithecus with the other Lemuridæ,
yet
I see I see 1860 1861 1866 |
I can see 1859 |
there is 1869 1872 |
no difficulty in supposing that such links formerly existed, and that each had been formed by
the same steps
as in
the case of the
less perfectly gliding squirrels; and that
each grade of structure had been
useful to its possessor. Nor can I see any insuperable difficulty in further believing it possible
that the membrane-connected
fingers and fore-arm
of the Galeopithecus might be
greatly lengthened by natural selection;
and this, as far as the organs of flight are concerned, would convert it
into a bat. In
bats which have bats which have 1859 1860 1861 1866 |
certain bats which have 1869 |
certain bats in which 1872 |
the wing-membrane extended
from the top of the shoulder to the tail,
including
the hind-legs, we perhaps
see see 1859 1860 1861 1866 1872 |
yet see actual 1869 |
traces of an apparatus originally
constructed constructed 1859 1860 1861 1866 | fitted 1869 1872 |
for gliding through the air rather than for flight. |
|
If about a dozen genera of birds had
become extinct
or were unknown,
who would have ventured to
have have 1859 1860 | have 1861 1866 1869 1872 |
surmised surmised 1859 1860 | surmise 1861 1866 1869 1872 |
that birds might have existed which used their wings solely as flappers, like the logger-headed duck (Micropterus of Eyton); as fins in the water and front legs
on the land, like the penguin; as sails, like the ostrich; and functionally for no purpose, like the
Apteryx. Apteryx. 1859 1860 | Apteryx? 1861 1866 1869 1872 |
Yet the structure of each of these birds is good for it, under the conditions of life to which it is exposed, for each has to live by a struggle; but it is not necessarily the best possible under all possible conditions. It must not be inferred from these remarks that any of the grades of wing-structure here alluded to, which perhaps may all have resulted from
disuse, indicate the natural
steps by which birds have
acquired their perfect power of flight; but they serve,
at least, to show what diversified means of transition are
possible. |
|
Seeing that a few members of such water-breathing classes as the Crustacea and Mollusca are adapted to
|
fitted for gliding through the air, now connect the Galeopithecus with the other
Lemuridæ, Lemuridæ, 1859 1860 1861 1866 1869 | Insectivora, 1872 |
yet
there is there is 1869 1872 |
I can see 1859 |
I see 1860 1861 1866 |
no difficulty in supposing that such links formerly existed, and that each
had been formed by had been formed by 1859 1860 1861 1866 1869 |
was developed in 1872 |
the same
steps steps 1859 1860 1861 1866 1869 | manner 1872 |
as
in in 1859 1860 1861 1866 1869 | with 1872 |
the
case of the case of the 1859 1860 1861 1866 1869 |
OMIT 1872 |
less perfectly gliding squirrels;
and that and that 1859 1860 1861 1866 1869 | and that 1872 |
each grade of structure
was was 1860 1861 1866 1869 | had been 1859 | having been 1872 |
useful to its possessor. Nor can I see any insuperable difficulty in further believing
it possible it possible 1859 1860 1861 1866 1869 | it possible 1872 |
that the
membrane-connected membrane-connected 1859 1860 1861 1866 1869 | membrane connected 1872 |
fingers and
forearm forearm 1860 1861 1866 1869 | fore-arm 1859 1872 |
of the Galeopithecus might
be be 1859 1860 1861 1866 1869 | have been 1872 |
greatly lengthened by natural
selection; selection; 1859 1860 1861 1866 1869 | selection. 1872 |
and this, as far as the organs of flight are concerned, would
convert it convert it 1859 1860 1861 1866 1869 |
have converted the animal 1872 |
into a bat. In
certain bats which have certain bats which have 1869 |
bats which have 1859 1860 1861 1866 |
certain bats in which 1872 |
the wing-membrane
extended extended 1859 1860 1861 1866 1869 | extends 1872 |
from the top of the shoulder to the
tail, tail, 1859 1860 1861 1866 1869 | tail 1872 |
including including 1859 1860 1861 1866 1869 | and includes 1872 |
the hind-legs, we perhaps
yet see actual yet see actual 1869 |
see 1859 1860 1861 1866 1872 |
traces of an apparatus originally
fitted fitted 1869 1872 | constructed 1859 1860 1861 1866 |
for gliding through the air rather than for flight. |
|
If about a dozen genera of birds
had had 1859 1860 1861 1866 1869 | were to 1872 |
become
extinct extinct 1859 1860 1861 1866 1869 | extinct, 1872 |
or were unknown, or were unknown, 1859 1860 1861 1866 1869 |
OMIT 1872 |
who would have ventured to
....... 1861 1866 1869 1872 | have 1859 1860 |
surmise surmise 1861 1866 1869 1872 | surmised 1859 1860 |
that birds might have existed which used their wings solely as flappers, like the logger-headed duck (Micropterus of Eyton); as fins in the water and
front legs front legs 1859 1860 1861 1866 1869 | as front-legs 1872 |
on the land, like the penguin; as sails, like the ostrich; and functionally for no purpose, like the
Apteryx? Apteryx? 1861 1866 1869 1872 | Apteryx. 1859 1860 |
Yet the structure of each of these birds is good for it, under the conditions of life to which it is exposed, for each has to live by a struggle; but it is not necessarily the best possible under all possible conditions. It must not be inferred from these remarks that any of the grades of wing-structure here alluded to, which perhaps may all
have resulted from have resulted from 1859 1860 1861 1866 1869 |
be the result of 1872 |
disuse, indicate the
natural natural 1859 1860 1861 1866 1869 | natural 1872 |
steps by which birds
have have 1859 1860 1861 1866 1869 | actually 1872 |
acquired their perfect power of flight; but they
serve, serve, 1859 1860 1861 1866 1869 | serve 1872 |
at least, to show what diversified means of transition are at least, to show what diversified means of transition are 1859 1860 1861 1866 1869 |
to show what diversified means of transition are at least 1872 |
possible. |
|
Seeing that a few members of such water-breathing classes as the Crustacea and Mollusca are adapted to
|