CONTENTS. 



PLAN OF THE WORK xi 



THE WORD INSECT. 



Divisions of an insect's body . .17 



Distinguished from other animals . . ib. 



THE SKIN OF INSECTS 



Resembles the bones of other animals . . 20 



Layers of the skin . . .21 



Colours of the skin . . . ib. 



Pores of the skin . . ib. 



Hair and down on the skin . . ib. 



COMPOSITION OF THE SKIN. 



Discovery and chemical properties of chitine . 22 



THE HEAD IN INSECTS, 



Pieces of the head . . lb. 



Form of the head . . 23 



Divisions not determined . . . ib. 



Parts of the head . . ib. 



Members of the head . . .24 



The ears, the eyes, and the mouth . ib, 



Junction of the head with the corselet . ib. 



Position and motion of the head . . ib. 



M368512 



