Origin of Species Variorum

→ admit, in opposition to the judgment of most naturalists, that these 1872

believe that the great majority of naturalists are wrong and that the 1861 1869

believe that the great majority of naturalists are wrong and that that the 1866

→ the frequent occurrence of 1869 1872

a very general 1861

frequent occurrence of 1866

→ of time, namely, 1861 1866 1869 1872

namely, 1859 1860

→ so that here again we have undoubted evidence of change 1869 1872

but to this subject I shall have to return 1859 1860

so that here again we have undoubted evidence of change, though not strictly of variation, 1861 1866

→ direction required by the theory; but to this latter subject I shall return in the following 1872

following 1859 1860

direction required by my theory; but to this latter subject I shall have to return in the following 1861 1866

direction required by the theory; but to this latter subject I shall have to return in the following 1869

→ OMIT 1866 1869 1872

One other consideration is worth notice: 1859 1860 1861

→ probable 1869 1872

probably 1859 1860

highly probable that 1861 1866

→ that those which 1872

those which have 1859 1860 1861 1866

that those which have 1869

→ each species underwent 1869 1872

species have been undergoing 1866

→ was probably 1872

have probably been 1866

was, from the reasons lately assigned, probably 1869

→ it 1869 1872

these same species 1866

↑ 2 blocks not present in 1859 1860 1861 1869 1872; present in 1866

We may infer that this has been the case, from there being no inherent tendency in organic beings to become modified or to progress in structure, and from all modifications depending, firstly on long-continued variability, and secondly on changes in the physical conditions of life, or on changes in the habits and structure of competing species, or on the immigration of new forms; and such contingencies will supervene in most cases only after long intervals of time and at a slow rate. These changes, moreover, in the organic and inorganic conditions of life will affect only a limited number of the inhabitants of any one area or country.

→ with 1872

in the case of 1859 1860 1861 1866 1869

→ done. 1872

effected by palæontologists. 1859 1860 1861 1866 1869

is admitted to be very slight; so that here, unless we believe that these eminent naturalists have been misled by their

imaginations

imaginations,

and that these late tertiary species really present no difference whatever from their living representatives, or unless we →admit, in opposition to the judgment of most naturalists, that these tertiary species are all truly distinct from the recent, we have evidence of →the frequent occurrence of slight

modification

modifications

form of

....

the kind required.

Moreover, if

we look to rather wider

intervals,

intervals

→of time, namely, to distinct but consecutive stages of the same great formation, we find that the embedded fossils, though

almost

....

universally ranked as specifically different, yet are far more closely

allied

to each other than are the species found in more widely separated formations; →so that here again we have undoubted evidence of change in the →direction required by the theory; but to this latter subject I shall return in the following chapter.

→OMIT

with

With

animals and plants that

can

....

propagate rapidly and

are

not

highly locomotive,

wander much,

there is reason to suspect, as we have formerly seen, that their varieties are generally at first local; and that such local varieties do not spread widely and supplant their parent-forms until they have been modified and perfected in some considerable degree. According to this view, the chance of discovering in a formation in any one country all the early stages of transition between any two

such forms,

forms,

is small, for the successive changes are supposed to have been local or confined to some one spot. Most marine animals have a wide range; and we have seen that with plants it is those which have the widest range, that oftenest present varieties; so

that

that,

with shells and other marine animals, it is →probable →that those which had the widest range, far exceeding the limits of the known geological formations of Europe,

which

....

have oftenest given rise, first to local varieties and ultimately to new species; and this again would greatly lessen the chance of our being able to trace the stages of transition in any

ony

one

geological formation.

It is a more important consideration,

clearly

....

leading to the same result, as lately insisted on by Dr. Falconer, namely, that the

periods

period

during which →each species underwent modification, though

very

....