Origin of Species Variorum

→ I believe in 1859 1860 1861 1866

which includes 1869 1872

→ slow. 1859 1860 1861 1866

slow, and will generally affect only a few species at the same time; 1869 1872

→ variability be taken advantage of by 1859 1860 1861 1866

variations or individual differences as may arise will be accumulated through 1869 1872

→ and whether the variations be accumulated to 1859 1860 1861 1866

in 1869 1872

→ of 1859 1860 1861 1869 1872

thus causing a greater or lesser amount of 1866

→ modification in the varying species, 1859 1860 1861 1866

permanent modification, will 1869 1872

→ rate of breeding, on the 1859 1860 1861 1866

OMIT 1869 1872

→ and more especially 1859 1860 1861 1866

OMIT 1869 1872

→ the 1859 1860 1861 1866

new colonists, and on the nature of the 1869 1872

→ less. 1859 1860 1861 1866

in a less degree. 1869 1872

→ see the same fact in geographical distribution; 1859 1860 1861 1866

find similar relations between the inhabitants of distinct countries; 1869

find similar relations between the existing inhabitants of distinct countries; 1872

→ on that of the many 1859 1860 1861 1866

from the 1869 1872

→ that 1859 1860 1861 1866

in the struggle for life, that 1869 1872

These several facts accord well with

our

theory,

theory.

→I believe in no fixed law of development, causing all the inhabitants of

an area

a country

to change abruptly, or simultaneously, or to an equal degree. The process of modification must be

~~extremely~~

extremely

→slow.

for the

The

variability of each species is

~~quite~~

quite

independent of that of all others. Whether such →variability be taken advantage of by natural

selection

selection,

→and whether the variations be accumulated to a greater or

less degree,

lesser amount,

thus causing a greater or

less

lesser

amount,

amount

→of →modification in the varying species,

depend

depends

on many complex

contingencies—

contingencies,—

on the

variations

variability

being of a beneficial nature, on the

freedom

power

intercrossing

intercrossing,

and on

the →rate of breeding, on the slowly changing physical conditions of the country, →and more especially on the

immigration

nature

of →the other inhabitants with which the varying species

come

comes

into competition. Hence it is by no means surprising that one species should retain the same identical form much longer than others; or, if changing,

~~that it~~

that it

should change →less. We →see the same fact in geographical distribution; for instance,

the land-shells and coleopterous insects of Madeira

have

having

come to differ considerably from their nearest allies on the continent of Europe, whereas the marine shells and birds have remained unaltered. We can perhaps understand the apparently quicker rate of change in terrestrial and in more highly organised productions compared with marine and lower productions, by the more complex relations of the higher beings to their organic and inorganic conditions of life, as explained in a former chapter. When many of the inhabitants of

any area

a country

have become modified and improved, we can understand, on the principle of competition, and →on that of the many all-important relations of organism to

organism

organism,

→that any form which

did

does

not become in some degree modified and improved,