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or of the same kind, which 1859 1860 1861
which 1866
which, as I believe, 1869 1872

by 1859 1860 1861 1866
different from the fertile males and females through 1869 1872

as I believe to be quite possible, different 1859 1860 1861 1866
we may conclude 1869 1872

fertile males and females,— in this case, we may safely conclude from the 1859 1860
fertile males and females— in this case, we may safely conclude from the 1861 1866
OMIT 1869 1872

probably at first appear 1859 1860 1861
at first appear 1866
first arise 1869 1872

fertile parents 1859 1860 1861 1866
communities with females 1869 1872

have the desired 1859 1860 1861 1866
be thus 1869 1872

neuter-insects of 1859 1860
neuter insects of 1861 1866
in 1869 1872

species, in the same nest, 1859 1860 1861 1866
nest neuter insects, 1869 1872

different: in Cryptocerus, the workers of one caste alone carry a wonderful sort of shield on their heads, the use of which is quite unknown: in the Mexican
Myrme- cocystus,
Myrmecocystus,
the workers of one caste never leave the nest; they are fed by the workers of another caste, and they have an enormously developed abdomen which secretes a sort of honey, supplying the place of that excreted by the aphides, or the domestic cattle as they may be called, which our European ants guard
and
or
imprison.
It will indeed be thought that I have an overweening confidence in the principle of natural selection, when I do not admit that such wonderful and well-established facts at once annihilate
the
my
theory. In the simpler case of neuter insects all of one
caste,
caste
or of the same kind, which have been rendered by natural selection, as I believe to be quite possible, different from the fertile males and females,— in this case, we may safely conclude from the analogy of ordinary variations, that
the
each
successive, slight, profitable
modifications
modification
did not probably at first appear in all the
individual
individual
neuters in the same nest, but in
some
a
few alone; and that by the
survival
long-continued selection
of the fertile parents which
produce
produced
most neuters
having
with
the
advantageous
profitable
modification, all the neuters ultimately
come
came
to have the desired
characterized.
characterised.
character.
According to
On
this view we ought occasionally to find neuter-insects of the same species, in the same nest, presenting gradations of structure; and this we do find, even
frequently,
not rarely,
often,
considering how few
neuter insects
neuter-insects
out of Europe have been carefully examined. Mr. F. Smith has shown
that
how surprisingly
the neuters of several British ants differ
surprisingly from
from
each other in size and sometimes in colour; and that the extreme forms can
sometimes
sometimes
be
perfectly
perfectly
linked together by individuals taken out of the same nest: I have myself compared perfect gradations of this kind. It
sometimes
often
happen
happens
that the larger or the smaller sized workers