I should
never have
anticipated
that
natural
selection
could have
been
efficient
in so high
a degree,
had not
the case
of these
neuter
insects
convinced
me of the
fact. I
have,
therefore,
discussed
this case,
at some
little but
wholly
insufficient
length, in
order to
show the
power of
natural
selection,
and
likewise
because
this is by
far the
most
serious
special
difficulty,
which my
theory has
encountered.
The case,
also, is
very
interesting,
as it
