Text Appearing Before Image: WHAT AN INSECT IS LIKE: OUTSIDE HEAD THORAX The head bears the eyes, the antennae and the mouth- parts. The eyes are of two sorts: Compound eyes: a single large pair at the sides of the head. If the surface of one of these be examined with a lens it will be seen to be com- posed of a multitude of shining, transparent hex- agonal facets. Each facet bears a little lens through which the light enters, to reach the sensitive nervous apparatus in- side. Each unit of the compound eye contri- butes its own spot light, giving inside what is called a mosaic pattern. This type of eye, so dif- ferent from our own, is believed to be especially good for detecting mov- ing objects. Simple eyes, or ocelli: there are three of these on the top of the head between the compound eyes, minute shining con- vex spots, each with a single lenticular cornea; one ocellus ABDOMEN Text Appearing After Image: Fig. 2. -A diagram of the structure of an insect.
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