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1859
1860
1861
1866
1869
1872

Compare with:
1860
1861
1866
1869
1872

of structure, this being 1859 1860 1861 1866
which were 1869 1872

which 1859 1860 1861 1866
and that these 1869 1872

structure which have become correlated to 1859 1860 1861 1866
inherited structure which are correlated with 1869 1872

in 1859 1860 1861 1866
the oxen of 1869 1872

in comparison with 1859 1860 1861 1866
relatively to the length of 1869 1872

1 blocks not present in 1859 1860 1861 1866 1869; present in 1872
Breeders of cattle wish the flesh and fat to be well marbled together: an animal thus characterised has been slaughtered, but the breeder has gone with confidence to the same stock and has succeeded.

a well-flavoured vegetable is cooked, and the individual is destroyed; 1859 1860 1861
breeders of cattle wish the flesh and fat to be well marbled together; the animal has been slaughtered, 1866 1869

horticulturist sows seeds of 1859 1860 1861
breeder has gone with confidence to 1866 1869

confidently expects to get nearly the same variety; breeders of cattle wish the flesh and fat to be well marbled together; the animal has been slaughtered, but the breeder goes with confidence to the same family. 1859
confidently expects to get nearly the same variety: breeders of cattle wish the flesh and fat to be well marbled together; the animal has been slaughtered, but the breeder goes with confidence to the same family. 1860
confidently expects to get nearly the same variety: breeders of cattle wish the flesh and fat to be well marbled together; the animal has been slaughtered, but the breeder goes with confidence to the same stock. 1861
has succeeded. 1866 1869

having been born with
some
some
slight profitable
modifications,
modification
of structure, this being inherited by
the
its
offspring;
offspring,
which again varied and
again were
were again
selected, and so
on wards.
onwards.
But with the working ant we have an insect differing greatly from its parents, yet absolutely
sterile,
sterile;
so that it could never have transmitted successively acquired modifications of structure or instinct to its progeny. It may well be asked how is it possible to reconcile this case with the theory of natural selection?
First, let it be remembered that we have innumerable instances, both in our domestic productions and in those in a state of nature, of all sorts of differences of structure which have become correlated to certain ages, and
with
to
either sex. We have differences correlated not only
with
to
one sex, but
with
to
that short period
alone
alone
when the reproductive system is active, as in the nuptial plumage of many birds, and in the hooked jaws of the male salmon. We have even slight differences in the horns of different breeds of cattle in relation to an artificially imperfect state of the male sex; for oxen of certain breeds have longer horns than in other breeds, in comparison with the horns
in both
of
the bulls
and
or
cows of these same breeds. Hence I can see no
great
real
difficulty in any character
becoming
having become
correlated with the sterile condition of certain members of insect-communities: the difficulty lies in understanding how such correlated modifications of structure could have been slowly accumulated by natural selection.
This difficulty, though appearing insuperable, is
les- sened,
lessened,
or, as I believe, disappears, when it is remembered that selection may be applied to the family, as well as to the individual, and may thus gain the desired end. Thus, a well-flavoured vegetable is cooked, and the individual is destroyed; but the horticulturist sows seeds of the same
family,
stock
stock,
and confidently expects to get nearly the same variety; breeders of cattle wish the flesh and fat to be well marbled together; the animal has been slaughtered, but the breeder goes with confidence to the same family.