You see you can move your fist around in all directions.

The insect can move its antennæ in all directions because they are
fastened to its head by ball-and-socket joints.

On the segments of the antennæ, particularly towards the tip, are little
dots.

You cannot see the dots without the help of a strong microscope, but
they are there.

These little dots are sensitive spots. There is a nerve coming from the
insect's brain to each dot.

Some of the dots are sensitive to odors, just as the nerves of our nose
are sensitive to odors.

May thinks it is very funny that the insects smell with antennæ instead
of with noses.

The insects, no doubt, would think it very funny for us to smell with,
noses instead of with antennæ, if they thought about it at all.

The little dots on the antennæ are extremely sensitive to smells. They
are often much more sensitive than our noses.

Put a bit of food at some distance from a hungry cockroach, and it will
not be long before a pair of long, sensitive feelers will come waving to
and fro out of some dark corner.