Of the services rendered by the scavenger-insects, [169]

Of the value of certain insects as food, [170]

As, for instance, in the case of the locust, [171]

The law of retaliation illustrated, [172]

CHAPTER V.—A PHANTASMAGORIA OF LIGHT AND COLOUR.

How does the insect express its intensity of vital force? [175] In various ways, but specially through its glowing hues, [176]

Which are displayed with a profusion that astonishes and almost overcomes the observer, [177]

But are not inconsistent with an ingenious mimicry, [177]

A diversion is made to the tropical forest, [178]