tink bug is not disturbed, it does not give forth the bad odor;
but when we jostle the bushes in getting the berries, that startles it,
and we get the benefit of its alarm.

Yes, undoubtedly the bugs make a bad odor for the same reason the
grasshoppers make molasses. They wish to repel their enemies.

Very few birds ever touch a stink bug.

Nell thinks a bird would be crazy to eat a stink bug.

Mollie says if it were not crazy when it began, it surely would be
before it got through!

Not only the bugs make these disagreeable odors.

Many other insects do.

The cockroaches, as we know, and one reason we dislike them so is
because of this offensive odor.

Some species of crickets, too, and indeed many, many insects give forth
odors from glands that exist just for that purpose.

No, indeed, these odors are not all alike. Some have a strangling
quality like ammonia, and sometimes the odors are not disagreeable. Some
insects have sweet odors, like perfumes.

[Illustration]

The pleasant odors are not used to repel, but to attract.

If an insect wishes to see its mate, it may be able to give forth a
pleasant odor that will reach a long way through the air, and the mate,
smelling it, will follow it to its source. You see, this pleasant odor
is one way of talking; at least it is one way of sending a message.

Insects can detect odors much better than we can.

No doubt many insects produce odors that affect other insects, but that
are so faint we cannot smell them at all.

The sense of smell, even in the human being, is very wonderful. It is
the keenest of all the senses.

You have studied weights and measures, and you know how small a quantity
a grain of anything is. Well, you will be astonished to know that your
nose can detect the presence of 1/2,760,000,000 of a grain of mercaptan,
a substance having a very bad smell.

[Illustration]

So you see, insects that can smell very, very much better than we would
be greatly influenced by the odors of other insects.

Some of the stink bugs, although so disagreeable if disturbed, are very
useful to us, as they eat other insects injurious to vegetation.

Most of them, however, eat fruits and vegetables, and some species do a
vast amount of mischief.

THE LOUSE

Yes, John, lice are bugs, and very mean bugs too.

They have lived at the expense of other creatures so long that they
cannot exist unless they have a living body to feed on.

Here is a pic