Origin of Species Variorum

→ on the common view, whether or not 1859 1860 1861

whether or not on the common view 1866

whether or not 1869 1872

→ are 1859 1860 1861 1866

ought to be called 1869 1872

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

As long as most of the links between any two species are unknown, if any one link or intermediate variety be discovered, it will simply be classed as another and distinct species.

→ Widely 1859 1860 1861

It is the dominant and widely 1866 1869 1872

→ vary 1859 1860 1861

which vary most frequently and vary 1866 1869 1872

→ less 1859 1860 1861

in any one formation less 1866 1869 1872

→ I am inclined to believe, has 1859 1860 1861

has probably 1866 1869 1872

→ in most cases separated 1861 1866 1869 1872

separated 1859 1860

→ for 1859 1860 1861 1866

of great length; for 1869 1872

→ generally be 1861 1866

be 1859 1860

as a general rule be 1869 1872

→ of fossiliferous formations 1859 1860 1861

of strata rich in fossils 1869 1872

OMIT 1866

→ lowest Silurian strata, 1859 1860 1861

lowest Silurian strata 1866

Cambrian formation, 1869 1872

→ I can only recur 1859 1860 1861

of formations rich in fossils of many kinds, I can recur only 1866

I can recur only 1869 1872

→ chapter. 1859 1860 1861 1866 1869

chapter; namely, that though our continents and oceans have endured for an enormous period in nearly their present relative positions, we have no reason to assume that this has always been the case; consequently formations much older than any now known may lie buried beneath the great oceans. 1872

→ which I require, 1859 1860 1861 1866

required by our theory, 1869 1872

slight. Numerous existing doubtful forms could be named which are probably varieties; but who will pretend that in future ages so many fossil links will be discovered, that naturalists will be able to

decide

decide,

→on the common view, whether or not these doubtful forms →are varieties? ↑ Only a small portion of the world has been

geological

geologically

explored. Only organic beings of certain classes can be preserved in a fossil condition, at least in any great number. →Widely ranging species →vary most, and varieties are often at first

local,—

local—

both causes rendering the discovery of intermediate links →less likely. Local varieties will not spread into other and distant regions until they are considerably modified and

im-

....

proved;

improved;

and when they

have

spread,

and are

discovered in a geological formation, they

~~will~~

will

appear as if suddenly created there, and will be simply classed as new species. Most formations have

been

been,

intermittent in their accumulation; and their

duration

duration,

→I am inclined to believe, has been shorter than the average duration of specific forms. Successive formations are →in most cases separated from each other by

~~enormous~~

enormous

blank intervals of

time

time;

→for fossiliferous

formations,

formations

thick enough to resist future

degradation,

degradation

can →generally be accumulated only where much sediment is deposited on the subsiding bed of the sea. During the alternate periods of elevation and of stationary level the record will

generally be

blank.

generally blank.

During these latter periods there will probably be more variability in the forms of life; during periods of subsidence, more extinction.

With respect to the absence →of fossiliferous formations beneath the →lowest Silurian strata, →I can only recur to the hypothesis given in the

tenth

ninth

→chapter. That the geological record is imperfect all will admit; but that it is imperfect to the degree →which I require, few will be inclined to admit. If we look to long enough

intervals

in- tervals