Origin of Species Variorum

→ 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 powers 1859

the high geometrical ratio 1860 1861 1866 1869

their geometrical rate 1872

→ of each species, 1859 1860 1861 1866 1869

a severe struggle for life 1872

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

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

at some age, season, or year, 1872

→ preservation, 1859 1860 1869

preservation 1861 1866

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

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

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.

→ with 1859 1860 1861 1866

or rivalry with 1872

→ males. 1859 1860 1861 1866

males; and these characters will be transmitted to one sex or to both sexes, according to the form of inheritance which prevails. 1872

→ nature, in modifying and 1859 1860 1861 1866

OMIT 1869 1872

→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 powers of

increase,

increase

→of each species, →at some age, season, or year, a severe struggle for life, 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~~

I think

it would be a most extraordinary fact if no

variations

variation

had ever

ever

ever had

occurred useful to each

beings

being's

own welfare, in the same

manner

way

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

ever do

ever occur,

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. ↑ 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 animals, sexual selection will

have given

give

its aid to ordinary selection, by assuring to the most vigorous and best adapted males the greatest number of offspring. Sexual selection will also give characters useful to the males alone, in their struggles →with other →males.

Whether natural selection has really thus acted in →nature, in modifying and adapting the various forms of life to their several conditions and stations, must be judged

by the general

tenor

tenour

and balance of

the evidence

evidence

given in the following chapters. But we

have already

already

seen

see

how it entails extinction; and how largely extinction has acted in the

worlds

world's

history, geology plainly declares. Natural selection, also, leads to divergence of