Origin of Species Variorum

→ during the long course of ages and under varying 1859 1860 1861 1866

under changing 1869 1872

→ vary at all in the several 1859 1860 1861 1866

present individual differences in all 1869

present individual differences in almost every 1872

→ the high geometrical ratio 1860 1861 1866 1869

the high geometrical powers 1859

their geometrical rate 1872

→ of each species, 1859 1860 1861 1866 1869

a severe struggle for life 1872

→ a severe struggle for life at some age, season, or year, 1860 1861 1866 1869

at some age, season, or year, a severe struggle for life, 1859

at some age, season, or year, 1872

→ preservation 1861 1866

preservation, 1859 1860 1869

pre- servation, or the survival of the fittest, 1872

→ I 1859 1860 1861 1866 1872

or the survival of the fittest, I 1869

→ for the sake of brevity, 1859 1860 1861 1866

OMIT 1869 1872

→ Selection. 1859 1861 1866 1869 1872

Selection; and it leads to the improvement of each creature in relation to its organic and inorganic conditions of life. 1860

will

not pretend to

say;

assign;

but conjointly they must limit in each country the tendency to an indefinite augmentation of specific forms.

Summary

Chapter .—

Chapter. —

Chapter.

If,

→during the long course of ages and under varying conditions of

life

life,

organic beings →vary at all in the several

part

parts

of their

structure,

organisation,

and

~~I think~~

I think

this cannot be disputed; if there be, owing to →the high geometrical ratio of

increase,

increase

→of each species, →a severe struggle for life at some age, season, or year, and this certainly cannot be disputed; then, considering the infinite complexity of the relations of all organic beings to each other and to their conditions of

life,

existence,

causing an infinite diversity in structure, constitution, and habits, to be advantageous to them,

I think

....

it would be a most extraordinary fact if no

variations

variation

ever had

ever

had ever

occurred useful to each

beings

being's

own welfare, in the same

way

manner

as so many variations have occurred useful to man. But if variations useful to any organic being

ever do

occur,

ever occur,

assuredly individuals thus characterised will have the best chance of being preserved in the struggle for life; and from the strong principle of

inheritance

inheritance,

these

they

will tend to produce offspring similarly characterised. This principle of →preservation →I have

called

called,

→for the sake of brevity, Natural →Selection. It leads to the improvement of each creature in relation to its organic and inorganic conditions of life; and consequently, in most cases, to what must be regarded as an advance in organisation.

Nevertheless,

Nevertheless

low and simple forms

will

would

long endure if well fitted for their simple conditions of

life.

Natural selection, on the principle of qualities being inherited at corresponding ages, can modify the egg, seed, or young, as easily as the adult. Amongst many