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1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1866
1869
1872

highly probable that 1861 1866
probably 1859 1860
probable 1869 1872

those which have 1859 1860 1861 1866
that those which have 1869
that those which 1872

1 blocks not present in 1859 1860 1861; present in 1866 1869 1872
It is a more important consideration, clearly leading to the same result, as lately insisted on by Dr. Falconer, namely, that the periods during which species have been undergoing modification, though very long as measured by years, have probably been short in comparison with the periods during which these same species remained without undergoing any change.

in the case of 1859 1860 1861 1866 1869
with 1872

effected by palæontologists. 1859 1860 1861 1866 1869
done. 1872

OMIT 1860 1861 1866 1869 1872
CHAP. IX. GEOLOGICAL RECORD. 1859

only 1859 1860 1861 1869 1872
distinct species from their European representatives, and by other conchologists as only 1866

only by the future geologist 1859 1860 1861 1866 1869
by the future geologist only by his 1872

is 1861 1866 1869 1872
seems to me 1859 1860

is entirely 1861 1866 1869
as we shall see in the next chapter, is certainly 1872

forms." We clearly see this if 1861
forms." We clearly see this if 1866 1869
forms." If 1872

varieties; so
that,
that
with shells and other marine animals, it is highly probable that those which have 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
one
ony
geological formation.
It should not be forgotten, that at the present day, with perfect specimens for examination, two forms can seldom be connected by intermediate
varieties
varieties,
and thus proved to be the same species, until many specimens
are
have been
collected from many places; and in the case of fossil species this
can
could
rarely be effected by palæontologists. We shall, perhaps, best perceive the improbability of our being enabled to connect species by
numerous,
numerous
fine,
intermediate,
intermediate
fossil links, by asking OMIT
ourselves
our-selves
whether, for instance, geologists at some future period will be able to
prove,
prove
that our different breeds of cattle, sheep, horses, and dogs
are
have
descended from a single stock or from several aboriginal stocks; or, again, whether certain sea-shells inhabiting the shores of North America, which are ranked by some conchologists as distinct species from their European representatives, and by other conchologists as only varieties, are really
varieties
varieties,
or are, as it is called, specifically distinct. This could be effected only by the future geologist discovering in a fossil state numerous intermediate
gra- dations;
gradations;
and such success is improbable in the highest degree.
It has been asserted over and over again, by writers who believe in the immutability of species, that geology
has
has
yields
yielded
no linking forms. This
assertion,
assertion
is entirely erroneous. As
Sir J.
Mr.
Lubbock has
recently
recently
remarked,
"Every
"Every
species is a link between other allied forms." We clearly see this if we take a genus having