See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1866
1869
1872

species, with 1859 1860 1861 1866
the species, with the 1869 1872

varieties; and with our domestic productions, 1859 1860 1861 1866
the varieties; and in some cases, as with domestic pigeons, 1869
the varieties; and in some cases, as with the domestic pigeon, with 1872

in classifying varieties, as with 1859 1860 1861 1866
as in classifying 1869 1872

be expressed by groups subordinate to groups; but the proper or even
the only
only
possible arrangement would still be genealogical; and this would be strictly natural, as it would connect together all languages, extinct and
recent,
modern,
by the closest affinities, and would give the filiation and origin of each tongue.
In confirmation of this view, let us glance at the classification of varieties, which are
known
believed
or
believed
known
to
be
have
descended from
a single
one
species. These are grouped under species, with sub-varieties under varieties; and with our domestic productions, several other grades of
difference.
difference
are
are
requisite.
requisite,
requisite,
as
as
as
we
we
we
have
have
have
seen
seen
seen
with
with
with
pigeons.
pigeons.
pigeons.
The origin of the existence of groups subordinate to
groups,
groups
is the same with varieties as with species, namely, closeness of descent with various degrees of modification. Nearly the same rules are followed in classifying varieties, as with species. Authors have insisted on the necessity of
arranging
classing
varieties on a natural instead of an artificial system; we are cautioned, for instance, not to class two varieties of the pine-apple together, merely because their fruit, though the most important part, happens to be nearly identical; no one puts the
swedish
Swedish
and common
turnip
turnips
together, though the esculent and thickened stems are so similar. Whatever part is found to be most constant, is used in classing varieties: thus the great agriculturist Marshall says the horns are very useful for this purpose with cattle, because they are less variable than the shape or colour of the body, &c.; whereas with sheep the horns are much less serviceable, because less constant. In classing
varieties;
varieties,
I apprehend
that if
if
we had a real pedigree, a genealogical classification would be universally
preferred:
preferred;
and it has been attempted
in
by
some
cases.
authors.
For we might feel sure, whether there had been more or less modification,
that the
the
principle of inheritance would