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1859
1860
1861
1866
1869
1872

Compare with:
1859
1861
1866
1869
1872

in the same manner as, only in most cases 1859 1860 1861
only in most cases 1866 1869
in the same manner as do the closely allied species of the same genus 1872

lesser degree than, do closely-allied species of the same genus in a 1859 1860 1861
lesser degree, in the same manner as do closely-allied species of the same genus in a 1866
less degree, in the same manner as do closely-allied species of the same genus in a 1869
OMIT 1872

nature. 1859 1860 1861 1866 1869
nature, but the differences in most cases are less in degree. 1872

when we find that there are hardly any 1859 1860 1861 1866
as true, for the 1869 1872

either amongst animals or plants, which have not 1859 1860 1861 1866
of many animals and plants have 1869 1872

mere varieties, 1859 1860
the descendants of aboriginally distinct species, 1861 1866 1869 1872

the descendants of aboriginally distinct species. 1859 1860
mere varieties. 1861 1866 1869 1872

I think it could 1859 1860
I think it can 1861 1866
It can 1869 1872

1 blocks not present in 1859 1860 1861 1866; present in 1869 1872
When it is explained how genera originate under nature, it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races.

of the same species, 1859 1860 1861 1866 1869
OMIT 1872

from each other, and from
the
....
other species of the same genus, in several trifling respects, they often differ in an extreme degree in some one part, both when compared one with another, and more especially when compared with
all
all
the species
under
in
nature to which they are nearest allied. With these exceptions (and with that of the perfect fertility of varieties when crossed, — a subject hereafter to be discussed), domestic races of the same species differ from each
other,
other
in the same manner as, only in most cases in a lesser degree than, do closely-allied species of the same genus in a state of nature.
I think
I think
that this
This
this
must be
admitted
admitted,
when we find that there are hardly any domestic
races
races,
either amongst animals or plants, which have not been ranked by
some
....
competent judges as mere varieties, and by other competent judges as the descendants of aboriginally distinct species. If any
well marked
marked
distinction existed between
a domestic
domestic
race
races
and
a species,
species,
this source of doubt
would
could
not so perpetually recur. It has often been stated that domestic races do not differ from each other in characters of generic value. I think it could be shown that this statement is
not
hardly
correct; but naturalists differ
most widely
much
widely
in determining what characters are of generic value; all such
valua- tions
valuations
being at present empirical. Moreover, on the view of the origin of genera which I shall presently give, we have no right to expect often to meet with generic differences in our domesticated productions.
In
When we
attempting
attempt
to estimate the amount of structural difference between
allied
the
domestic
races,
races
of the same species, we are soon involved in doubt, from not knowing whether they
are
have
descended from one or several
parent species.
parent-species.
This point, if it could be cleared up, would be interesting; if, for instance, it could be shown that the
grey- hound,
greyhound,
bloodhound, terrier, spaniel, and bull-dog, which we all know propagate their kind
so
so
truly, were the