See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1866
1869
1872

kinds of animals 1861 1866 1869 1872
animals 1859 1860

seem to be rarely 1861 1866 1869 1872
are 1859 1860

1 blocks not present in 1859 1860 1861 1866; present in 1869 1872
Lastly, many great deposits requiring a vast length of time for their accumulation, are entirely destitute of organic remains, without our being able to assign any reason: one of the most striking instances is that of the Flysch formation, which consists of shale and sandstone, several thousand, occasionally even six thousand feet, in thickness, and extending for at least 300 miles from Vienna to Switzerland; and although this great mass has been most carefully searched, no fossils, except a few vegetable remains, have been found.

from fossil remains 1859 1860 1861 1866 1869
OMIT 1872

not 1859 1860 1861 1866 1869
until recently not 1872

is 1859 1860 1861 1866
until quite recently was 1869
was 1872

of one species discovered 1860 1861 1866 1869 1872
discovered 1859

and Dr. Dawson in 1860 1861 1866 1869 1872
in 1859

America, of which shell above a hundred specimens have now been collected. 1861 1866 1869
America. 1859
America, of which shell several specimens have now been collected. 1860
America; but now land-shells have been found in the lias. 1872

the Supplement to 1859 1860 1861
OMIT 1866 1869 1872

kinds of animals which live on the beach between high and low
watermark
water mark
seem to be rarely preserved. For instance, the several species of the Chthamalinæ (a
subfamily
sub-family
of sessile cirripedes) coat the rocks all over the world in infinite numbers: they are all strictly littoral, with the exception of a single Mediterranean species, which inhabits deep
water
water,
and
this has
has
been found fossil in Sicily, whereas not one other species has hitherto been found in any tertiary
formation;
formation:
yet it is
now
now
known that the genus Chthamalus existed during the
Chalk
chalk
period. The molluscan genus Chiton offers a partially analogous case.
With respect to the terrestrial productions which lived during the Secondary and Palæozoic periods, it is superfluous to state that our evidence from fossil remains is fragmentary in an extreme degree. For instance, not a land shell is known belonging to either of these vast periods, with
one
the
exception of one species discovered by Sir C. Lyell and Dr. Dawson in the carboniferous strata of North America, of which shell above a hundred specimens have now been collected. In regard to mammiferous remains, a
single
single
glance at the historical table published in the Supplement to
Lyells
Lyell's
Manual
Manual,
will bring home the truth, how accidental and rare is their preservation, far better than pages of detail. Nor is their rarity surprising, when we remember how large a proportion of the bones of tertiary mammals have been discovered either in caves or in lacustrine deposits; and that not a cave or true lacustrine bed is
know
known
belonging to the age of our secondary or palæozoic formations.
But the imperfection in the geological record
mainly
largely
results from another and more important cause than any of the foregoing; namely, from the several
forma- tions
formations
being separated from each other by wide intervals of time. This doctrine has been
most
most
emphatically