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1859
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1869
1872

Compare with:
1859
1860
1861
1869
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organic beings 1859 1860 1861 1866
these organic beings which are 1869
these organic beings, which are 1872

choose to suppose that any of the 1859 1860 1861 1866
suppose any 1869 1872

I have been 1859 1860 1861 1866
I to have been 1869
I, to have become 1872

more or less completely lost 1859 1860 1861 1866
lost all 1869 1872

have been more or less completely lost,— as sometimes 1859 1860 1861 1866
likewise be lost,— as 1869
be lost, as 1872

existing 1859 1860 1861 1866
some few existing 1869 1872

3 blocks not present in 1859 1860 1861 1866 1869; present in 1872
But this genus, though much isolated, will still occupy its proper intermediate position. The representation of the groups, as here given in the diagram on a flat surface, is much too simple. The branches ought to have diverged in all directions.

as 1859 1860 1861 1866
in the diagram as 1869

in the diagram, 1859 1860 1861 1866
OMIT 1869

a branching diagram had not been used, and only 1859 1860 1861 1866 1869
OMIT 1872

written 1859 1860 1861 1866 1869
simply written down 1872

possible to have given a natural arrangement; 1859 1860 1861 1866 1869
natural; 1872

view which I hold, the 1859 1860 1861 1866 1869
OMIT 1872

some few still living
organisms
organic beings
belong to Silurian genera. So that the
comparative
amount or
value of the differences between organic beings all related to each other in the same degree in blood, has come to be widely different. Nevertheless their genealogical arrangement remains strictly true, not only at the present time, but at each successive period of descent. All the modified descendants from A will have inherited something in common from their common parent, as will all the descendants from I; so will it be with each subordinate branch of descendants, at each successive
stage.
period.
If, however, we choose to suppose that any of the
descendant
descendants
of
A,
A
or of I have been so much modified as to have more or less completely lost traces of
its
their
parentage, in this case,
its
their
place
places
in
the
a
natural
system
classification
will have been more or less completely lost,— as sometimes seems to have occurred with existing organisms. All the descendants of the genus F, along its whole line of descent, are supposed to have been but little modified, and they
yet
yet
form a single genus. But this genus, though much isolated, will still occupy its proper intermediate
position.
position;
for
for
F
F
originally
originally
was
was
intermediate
intermediate
in
in
character
character
between
between
A
A
and
and
I,
I,
and
and
the
the
several
several
genera
genera
descended
descended
from
from
these
these
two
two
genera
genera
will
will
have
have
inherited
inherited
to
to
a
a
certain
certain
extent
extent
their
their
characters.
characters.
This natural arrangement is
shown
shown,
as far as is possible on paper, in the diagram, but in much too simple a manner. If a branching diagram had not been used, and only the names of the groups had been written in a linear series,
the representation
it
would have been still less possible to have given a natural arrangement; and it is notoriously not possible to represent in a series, on a flat surface, the affinities which we discover in nature amongst the beings of the same group. Thus,
on
on
the view which I hold, the natural system is genealogical in its
arrangement,
arrange- ment,