GRASSHOPPERS AND CRICKETS. 39 
seed of the plant. It, too, is a single fertilized cell set 
apart for reproduction. The grasshopper deposits her 
eggs in the ground, using for this purpose the oviposi- 
tors at the end of her abdomen. From these eggs 
there hatch tiny insects much like their parents in 
shape, but destitute of wings. After a few days of 
eating, the little grasshopper becomes too large for his 
hard skin (exoskeleton), and proceeds to change it. 
The process of crawling out of the old skin is called 
Fic. 41.—Cockroach and Cast Skin. 
moulting. In this way he moults five times, after each 
moult appearing in every way more like the parent 
grasshopper. Like most other insects grasshoppers 
deposit an enormous number of eggs. 
Discovery. If one touches a stone it does not move, 
but if, on the other hand, one touches the feelers of a 
grasshopper, or moves a stick in front of its eyes, there 
is a movement in response to the irritation. This 
movement is usually entirely involuntary, like the 
