74 



FIRST BOOK OF ZOOLOGY. 



and chrysalides attached to the rails of the fence. Fig. 74 

 shows a portion of a fence of this kind. 



With the eggs, caterpillars, and chrysalides on hand, the 

 pupils are ready to study the life-history of an insect. 



71. Many animals, as fishes, snakes, and birds, lay eggs, 

 and from these eggs little creatures are hatched that resem- 

 ble the animals which laid the eggs. 



Insects also lay eggs, but from these eggs come little 

 creatures which do not at all resemble the insect that pro- 

 duced them. 



The different kinds of eggs collected by the pupils were 

 laid by insects of different kinds. For example, if they have 

 collected eggs like the following (Fig. 75), the insect that laid 

 them was a moth, and looked like Fig. 76. 



FIG. T6. INSECT WHICH LAID THE EGGS IN 

 FIG. 75. 



FIG. 75. EGGS LAID ON THE 

 TWIG OF AN APPLE-TKEE. 



Now, if the pupil will keep these eggs in a box, there 

 will hatch from them little animals resembling worms, very 

 tiny at first, but growing rapidly if supplied with appropriate 



