Exercises on Lesson XIII.
1. Explain why the pupæ of white butterflies are coloured like the objects they are attached to. 2. Write the life of a white butterfly, and illustrate your description with sketches of caterpillar, pupa, and butterfly. 3. The life of an insect is divided into four distinct stages. Name them. Which is the longest stage in the case of the white butterfly? 4. Describe, as you have observed it, the behaviour of a caterpillar as it passes from the larva to the chrysalis form.