he worm.

Because of the ease with which the cabbage-butterfly may be obtained and
the rapidity of its development in the various stages, it is very
suitable as a type for the study of metamorphosis.

The sulphur, or puddler (called by the latter name because of its habit
of settling in groups around the edges of the water holes), is also a
suitable type. The larvae in this case must be fed on clover.

THE TUSSOCK-MOTH

Begin the study of this insect in June and July by observing the larvae
feeding on the foliage of the horse-chestnut and other shade trees, and
direct attention to their destructiveness.

In observing the larvae, note the size, movements, legs, colour, coral
red head, tufts of hair on the back, and the three long plumes.

Watch the birds among the trees to discover whether they eat the larvae.

Of what use are the tufts of hair? Do the larvae feed by biting or by
sucking? Describe the damage done by the larvae.

Collect a number of these larvae and place them in the vivarium with some
twigs of horse-chestnut. Observe the spinning of the cocoon and, about
two weeks later, look for the emergence of the adult moths.

Observe the two kinds of insects. Describe each. Are there any
differences in the cocoons from which they emerge?

Which form of insect places the egg mass and is therefore the female?
Note the number and shape of the eggs and how they are protected.

The female moths have no wings and do not move far from the cocoons from
which they emerge, while the males have the power of flight.

As outdoor work, look for the egg masses on trees and fences and devise
means of combating the tussock-moth.

Gathering and destroying the egg masses during the winter is found to be
fairly effective in checking these insects. Since the cocoons
frequently contain parasites that prey upon the larvae, it is advisable
that only the cocoons that have egg masses attached to them should be
destroyed; the others are harmless and may contain the useful parasites.

The egg masses may be kept over winter in a box in a cool place, and the
hatching of the tiny larvae and their subsequent rapid growth observed.

POTATO BEETLE

The eggs of this beetle may be found in early summer in clusters on the
under surfaces of the leaves of potato plants.

EGG.--Observe the size, colour, shape, position, and number in a
cluster; appearance of head from outer end after a week.

LARVA.--Observe the colour, shape, head, le