Origin of Species Variorum

→ widely distinct structures and to whole 1869 1872

whole families or even 1859 1860 1861 1866

→ to a remote progenitor, may have become, through 1869 1872

in the parent-species, may become, by 1859

in the parent-species, may have become, by 1860 1861 1866

→ principles 1869 1872

principles— namely of each successive modification supervening at a rather late age, and being inherited at a corresponding late age— 1859 1861 1866

principles— namely of each successive modification supervening at a rather late age, and being inherited at a corre- sponding late age— 1860

→ will not have been much modified in 1869 1872

in 1859 1860 1861 1866

→ forms; although in each the embryonic fore-limb will differ greatly from that in the adult. 1869

descendants of the parent-species will still resemble each other closely, for they will not have been modified. 1859 1860 1866

descendants of the parent species will still resemble each other closely, for they will not have been modified. 1861

forms; although in each form the fore-limb will differ greatly in the adult state. 1872

↑ 1 blocks not present in 1869 1872; present in 1859 1860 1861 1866

But in each individual new species, the embryonic fore-limbs will differ greatly from the fore-limbs in the mature animal; the limbs in the latter having undergone much modification at a rather late period of life, and having thus been converted into hands, or paddles, or wings.

→ moreover, long-continued use or disuse 1869

long-continued exercise or use on the one hand, and disuse on the other, 1859 1860 1861

long-continued exercise or disuse 1866

long-continued use or disuse 1872

→ had in modifying the limbs or other parts of animals, this will chiefly or solely have affected them when mature and when they had to use their 1869

in modifying an organ, such influence will mainly affect the mature animal, which has come to its 1859 1860 1861

had in modifying an organ, such influence will mainly affect the mature animal, which has come to its 1866

had in modifying the limbs or other parts of any species, this will chiefly or solely have affected it when nearly mature, when it was compelled to use its 1872

→ OMIT 1869 1872

of activity and has 1859 1860 1861 1866

→ be transmitted to the offspring 1869

be inherited 1859 1860 1861 1866

have been transmitted to the offspring 1872

→ not 1869

remain unmodified, or 1859 1860 1861 1866

not be modified, or 1872

→ be modified 1859 1860 1861 1866 1869

will be modified only 1872

→ or will be modified in a less degree. 1869

in a lesser degree, by the effects of use and disuse. 1859 1860 1861 1866

in a slight degree, through the effects of the increased use or disuse of parts. 1872

→ In other cases 1869

In certain cases 1859 1860 1861 1866

With some animals 1872

→ variations may have supervened 1869 1872

steps of variation might supervene, from causes of which we are wholly ignorant, 1859 1860 1861 1866

→ may have been 1869 1872

might be 1859 1860 1861 1866

→ case, as we have seen with the short-faced tumbler, 1869

case (as with the short-faced tumbler) 1859 1860 1861 1866

of these cases, 1872

→ parent-form. 1859 1860 1861 1866 1869

parent-form, as we have seen with the short-faced tumbler. 1872

→ And 1869 1872

We have seen that 1859 1860 1861 1866

→ or sub-groups, 1869

of animals, 1859 1860 1861 1866

or in certain sub-groups alone, 1872

→ land-shells, fresh-water crustaceans, 1866 1869 1872

and 1859 1860 1861

→ some 1869 1872

with a few 1859 1860 1861 1866

→ these groups not passing through 1869

these cases not undergoing 1859 1860 1861 1866

such groups not passing through 1872

→ OMIT 1866 1869 1872

or closely resembling their parents from their earliest age, 1859 1860 1861

→ OMIT 1869 1872

during a course of modification carried on for many generations, 1859 1860 1861 1866

resemble each other much more closely than do the

adults,

adults,—

just as we have seen

with

the

case

breeds

pigeons.

the pigeon.

We may extend this view to →widely distinct structures and to whole classes. The fore-limbs, for instance, which

served

once served

as legs →to a remote progenitor, may have become, through a long course of modification, adapted in one descendant to act as hands, in another as paddles, in another as wings;

and

but

on the above two →principles the fore-limbs →will not have been much modified in the embryos of

the

these

several →forms; although in each the embryonic fore-limb will differ greatly from that in the adult. ↑ Whatever

influence

influence,

→moreover, long-continued use or disuse may have →had in modifying the limbs or other parts of animals, this will chiefly or solely have affected them when mature and when they had to use their full powers →OMIT

had to

gain

its

their

own living; and the

effects

effect

thus produced will →be transmitted to the offspring at

the

corresponding

nearly mature

mature