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136
My Studio Neighbors
·
W. Hamilton Gibson
105
Ere
it
can
reach
the
sweets
the
insect's
head
must
be
forced
well
into
the
throat
of
the
blossom,
where
we
now
observe
a
most
remarkable
special
provision,
the
space
between
the
two
pollen
discs
being
exactly
adjusted
to
the
diameter
of
the
insect's
head.
What
follows
this
entrance
of
the
moth
is
plainly
pictured
in
the
progressive
series
of
illustrations
(Fig.
6).
A
represents
the
insect
sipping;
the
sticky
discs
are
brought
in
contact
with
the
moth's
eyes,
to
which
they
adhere,
and
by
which
they
are
withdrawn
from
their
pouches
as
the
moth
departs
(B).
At
this
time
they
are
in
the
upright
position
shown
at
C,
but
in
a
few
seconds
bend
determinedly
downward
and
slightly
towards
each
other
to
the
position
D.
This
change
takes
place
as
the
moth
is
flitting
from
flower
to
flower.
At
E
we
see
the
moth
with
its
tongue
entering
the
nectary
of
a
subsequent
blossom.
By
the
new
position
of
the
pollen
clubs
they
are
now
forced
directly
against
the
stigma
(E).
This
surface
is
viscid,
and
as
the
insect
leaves
the
blossom
retains
the
grains
in
contact
(F),
which
in
turn
withdraw
others
from
the
mass
by
means
of
the
cobwebby
threads
by
which
the
pollen
grains
are
continuously
attached.
At
G
we
see
the
orchid
after
the
moth's
visit--the
stigma
covered
with
pollen,
and
the
flower
thus
cross-fertilized.
In
effecting
the
cross-fertilization
of
one
of
the
younger
flowers
its
eyes
are
again
brought
into
contact
with
this
second
pair
of
discs,
and
these,
with
their
pollen
clubs,
are
in
turn
withdrawn,
at
length
perhaps
resulting
in
such
a
plastering
of
the
insect's
eyes
as
might
seriously
impair
its
vision,
were
it
not
fortunately
of
the
compound
sort.
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