Origin of Species Variorum

→ their 1869 1872

they have existed in 1861 1866

→ have 1869 1872

which, as already explained, 1861 1866

→ OMIT 1869 1872

and in nearly every class, 1861 1866

→ variations or individual differences of a favourable nature 1869

favourable variations 1861 1866

variations or individual differences of a favorable nature 1872

→ OMIT 1869 1872

A difficulty, diametrically opposite to this which we have just been considering, has been advanced, namely, 1861 1866

→ it has been asked, could 1869 1872

could 1861 1866

→ the advancement or differentiation 1869 1872

advancement or in the differentiation and specialisation 1861 1866

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

I can make no sufficient answer; and can only say that as we have no facts to guide us, all speculation on the subject would be baseless and useless.

→ OMIT 1869 1872

would come into action, namely, 1866

→ different" would come into action. 1869 1872

different." 1866

→ thus 1869 1872

through their preservation either 1861

through their preservation, either 1866

→ as I remarked 1866 1869 1872

I must recur to what was stated 1861

isolated

peculiar

stations, where they have been subjected to less severe competition, and where →their scanty

numbers,

numbers

→have

retards

retarded

the chance of

favorable

favourable

variations arising.

Finally, I believe that

lowly

many lowly

organised forms now exist

in numbers

....

throughout the world, →OMIT from various causes. In some cases →variations or individual differences of a favourable nature may never have arisen for natural

selec- tion

selection

to act on and accumulate. In no case, probably, has time sufficed for the utmost possible amount of development. In some few cases there

may have

has

been what we must call retrogression of organisation. But the main cause lies in the

circumstance

fact

that under very simple conditions of life a high organisation would be of no service,— possibly would be of actual disservice, as being of a more delicate nature, and more liable to be put out of order and

thus

....

injured.

→OMIT

looking

that, looking

Looking

to the

dawn

first dawn

of life, when all organic beings, as we may

imagine,

believe,

presented the simplest structure,

how

how,

→it has been asked, could the first steps in →the advancement or differentiation of parts have arisen? ↑ Mr. Herbert Spencer would probably answer

that,

that

as soon as

the most

....

simple unicellular organism came by growth or division to be compounded of several cells, or became attached to any supporting surface, his law →OMIT "that homologous units of any order become differentiated in proportion as their relations to incident forces become →different" would come into action. But as we have no facts to guide us,

~~all~~

all

speculation on the subject is

almost useless.

useless.

It is, however, an error to suppose that there would be no struggle for existence, and, consequently, no natural selection, until many forms had been produced: variations in a single species inhabiting an isolated station might be beneficial,

and,

and

→thus the whole mass of individuals might

become

modified, or two distinct forms might arise.

But

But,

→as I remarked