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136
My Studio Neighbors
·
W. Hamilton Gibson
107
The
pollen
discs
are
here
very
close
together,
and
are
protected
within
a
membraneous
cup,
in
which
they
sit
as
in
a
socket.
As
the
insect
inserts
his
head
at
the
opening
(A)
it
is
brought
against
this
tender
membrane,
which
ruptures
and
exposes
the
viscid
glands
of
the
pollen
masses,
which
become
instantly
attached
to
the
face
or
head,
perhaps
the
eyes,
of
the
burly
visitor.
As
the
insect
retreats
from
the
flower,
one
or
both
of
the
pollinia
are
withdrawn,
as
at
B.
Then
immediately
follows
a
downward
movement,
which
exactly
anticipates
the
position
of
the
stigma,
and
as
the
bee
enters
the
next
flower
the
pollen
clubs
are
forced
against
it
(C),
as
in
the
previous
example.
In
the
case
of
a
smaller
bee
visiting
the
flower,
the
insect
would
find
it
necessary
to
creep
further
into
the
opening,
and
thus
might
bring
its
thorax
against
the
pollen-glands.
In
either
case
the
change
of
position
in
the
pollinia
would
insure
the
same
result.
We
have
thus
seen
adaptation
to
the
thorax,
the
eyes,
and
the
face
in
the
three
examples
given.
And
the
entrance
of
the
flower
in
each
instance
is
so
formed
as
to
insure
the
proper
angle
of
approach
for
the
insect
for
the
accomplishment
of
the
desired
result.
This
direct
approach,
so
necessary
in
many
orchids,
is
insured
by
various
devices--by
the
position
of
the
lip
upon
which
the
insect
must
alight;
by
the
narrowed
entrance
of
the
throat
of
the
flower
in
front
of
the
nectary;
by
a
fissure
in
the
centre
of
the
lip,
by
which
the
tongue
is
conducted,
etc.
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