Origin of Species Variorum

→ rich in fossils and thick 1861 1866

thick 1859 1860

rich in fossil species of very many kinds and thick 1869

rich in fossil species of many kinds, and thick 1872

→ most of our 1861 1866 1869 1872

the 1859 1860

→ local. 1859 1860 1861

local; and lastly, although each species must have passed through numerous transitional stages, it is probable that the periods, during which each underwent modification, though many and long as measured by years, have been short in comparison with the periods during which each remained in an unchanged condition. 1866 1869 1872

→ must have made the geological record extremely imperfect, and 1861

must have tended to make the geological record extremely imperfect, and 1859 1860

OMIT 1866 1869 1872

→ find 1861 1866

not find 1859 1860

find many links— we do not find 1869 1872

→ many links between the members of the same group— we do not find interminable 1861

interminable 1859 1860 1869 1872

many links between the species of the same group— we do not find interminable 1866

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

It should also be constantly borne in mind that any linking varieties between two or more forms, which might be found, would be ranked, unless the whole chain could be perfectly restored, as so many new and distinct species; for it is not pretended that we have any sure criterion by which species and varieties can be discriminated.

have attempted to show that the geological record is extremely imperfect; that only a small portion of the globe has been geologically explored with care; that only certain classes of organic beings have been largely preserved in a fossil state; that the number both of specimens and of species, preserved in our museums, is absolutely as nothing compared with the

~~incalculable~~

incalculable

number of generations which must have passed away even during a single formation; that, owing to subsidence being

necessary

almost necessary

for the accumulation of

fossiliferous

....

deposits →rich in fossils and thick enough to

outlast

resist

future degradation,

great

enormous

intervals of time

must have

have

elapsed between →most of our successive formations; that there has probably been more extinction during the periods of subsidence, and more variation during the periods of elevation, and during the latter the record will have been least perfectly kept; that each single formation has not been continuously deposited; that the duration of each formation is,

probably,

perhaps,

short compared with the average duration of specific forms; that migration has played an important part in the first appearance of new forms in any one area and formation; that widely ranging species are those which have varied

most

most,

frequently, and

and

have oftenest given rise to new species;

~~and~~

and

that varieties have at first

~~often~~

often

been →local.

All