Origin of Species Variorum

→ there is 1869 1872

I can see 1859

I see 1860 1861 1866

→ 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

→ certain bats which have 1869

bats which have 1859 1860 1861 1866

certain bats in which 1872

→ yet see actual 1869

see 1859 1860 1861 1866 1872

→ or were unknown, 1859 1860 1861 1866 1869

OMIT 1872

→ have resulted from 1859 1860 1861 1866 1869

be the result of 1872

→ 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

fitted for gliding through the air, now connect the Galeopithecus with the other

Insectivora,

Lemuridæ,

yet →there is no difficulty in supposing that such links formerly existed, and that each →had been formed by the same

manner

steps

with

the →case of the less perfectly gliding squirrels;

~~and that~~

and that

each grade of structure

had been

having been

was

useful to its possessor. Nor can I see any insuperable difficulty in further believing

~~it possible~~

it possible

that the

membrane connected

membrane-connected

fingers and

fore-arm

forearm

of the Galeopithecus might

have been

greatly lengthened by natural

selection.

selection;

and this, as far as the organs of flight are concerned, would →convert it into a bat. In →certain bats which have the wing-membrane

extends

extended

from the top of the shoulder to the

tail

tail,

and includes

including

the hind-legs, we perhaps →yet see actual traces of an apparatus originally

constructed

fitted

for gliding through the air rather than for flight.

If about a dozen genera of birds

were to

had

become

extinct,

extinct

→or were unknown, who would have ventured to

have

....

surmised

surmise

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

as front-legs

front legs

on the land, like the penguin; as sails, like the ostrich; and functionally for no purpose, like the

Apteryx.

Apteryx?

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~~

natural

steps by which birds

actually

have

acquired their perfect power of flight; but they

serve

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