See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1866
1869
1872

itself 1859 1860 1861 1866 1869
the highest degree 1872

in their affinities they 1860 1861 1866 1869 1872
they 1859

which 1859 1860 1861
both of which 1866 1869
both 1872

all species first existed as 1859 1860 1861
each existed first as a 1866 1869 1872

selection, even if we
look
looked
no
further
farther
than this, seems to
me to
me to
be in itself probable. I have already recapitulated, as fairly as I could, the opposed difficulties and objections: now let us turn to the special facts and arguments in favour of the theory.
On the view that species are only strongly marked and permanent varieties, and that each species first existed as a variety, we can see why it is that no line of demarcation can be drawn between species, commonly supposed to have been produced by special acts of creation, and varieties which are acknowledged to have been produced by secondary laws. On this same view we can understand how it is that in
a
each
region where many species of a genus have been produced, and where they now flourish, these same species should present many varieties; for where the manufactory of species has been active, we might expect, as a general rule, to find it still in action; and this is the case if varieties be incipient species. Moreover, the species of the larger genera, which afford the
great
greater
number of varieties or incipient species, retain to a certain degree the character of varieties; for they differ from each other by a less amount of difference than do the species of smaller genera. The closely allied species also of the larger genera apparently have restricted ranges, and in their affinities they are clustered in little groups round other species— in which respects
they
they
resembling
resemble
varieties. These are strange relations on the view
that
of
each species
was
having been
independently created, but are intelligible if all species first existed as
variety.
varieties.
As each species tends by its geometrical
rate
ratio
of reproduction to increase inordinately in number; and as the modified descendants of each species will be enabled to increase by
as
so
much
the more
the more
as they