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there is a constant tendency in their characters 1859 1860 1861 1866 1869
they constantly tend 1872

diverge. 1859 1860 1861 1866 1869
diverge in character. 1872

conclusion was 1859 1860 1861 1866
latter conclusion is 1869 1872

less divergent, the 1859 1860 1861
preceding, less divergent and 1866 1869 1872

genera on this 1859 1860 1861 1866
whole of the genera along this upper 1869 1872

though less, in common; 1859 1860 1861 1866 1869
in common, though less than when grouped in sub-families; 1872

species. Consequently the groups which are now large, and which generally include many dominant species, tend to go on increasing
indefinitely
indefinitely
in size. I further attempted to show that from the varying descendants of each species trying to occupy as many and as different places as possible in the economy of nature, there is a constant tendency in their characters to diverge. This conclusion was supported by
observing
looking at
the great diversity of
the
the
forms
of life
of life
which, in any small area, come into the closest competition, and by
looking to
looking to
certain facts in naturalisation.
I attempted also to show that there is a
steady
constant
tendency in the forms which are increasing in number and diverging in character, to supplant and exterminate the less divergent, the less
improved
improved,
and preceding
and preceding
forms. I request the reader to turn to the diagram illustrating the action, as formerly explained, of these several principles; and he will see that the inevitable result
is,
is
that the modified descendants proceeding from one progenitor become broken up into groups subordinate to groups. In the diagram each letter on the uppermost line may represent a genus including several species; and
all
all
the genera on this
upper line
line
form together one class, for all
are
have
descended from one ancient
but unseen
but unseen
parent
parent,
and, consequently, have inherited something in common. But the three genera on the left hand have, on this same principle, much in common, and form a sub-family, distinct from that
containing
including
the next two genera on the right hand, which diverged from a common parent at the fifth stage of descent. These five genera have also
much
much,
though less, in common; and they form a family distinct from that
containing
including
the three genera still
farther
further
to the right hand, which diverged at
an
a still
earlier period. And all these genera,
pescended
descended
from (A), form an order distinct from the