6 
a very sound and serviceable amount of information 
which we can work on from if we choose, but of practical 
use as it stands. 
With regard to the first point, that is whether the 
creature under examination is an insect, one difficulty 
in gaining a knowledge of insects arises from their pass¬ 
ing their lives in three different conditions ; 1st, that of 
the larva —that is the grub, maggot, or caterpillar ; 2nd, 
Goat MoGi caterpillar (half-grown), and chrysalis. 
thepdpu, or chrysalis ; 3rd, the imago, or perfect insect, 
in which they are often as distinct in appearance in one 
stage from the others as if they were different creatures. 
In the perfect state they may usually be known by 
possessing a distinct head, thorax or trunk, and abdomen, 
the head being furnished with eyes, simple or com¬ 
pound, or both, jaws of very'various form, and horn-like 
appendages on the front of the head, known as antennae ; 
