TYPICAL LESSON PLANS 141 



and then upon the leaves. What were they doing ? Look 

 on the under side of the cabbage leaves for the eggs that 

 the butterflies deposit there. There are small cream or 

 light yellow bodies standing on end on the surface of the 

 leaves in size not as large as the head of a pin. Are these 

 eggs grouped or single? Do you find as many on the 

 upper surface as on the lower ? Is there any advantage in 

 having the eggs on the lower surface? 



Place the leaves on plates or in a box, to see if the eggs 

 will hatch. It is not necessary to wait, however, for these 

 tiny creatures to grow before continuing the study. Ob- 

 serve some of the worms or larvae that are already quite 

 large. Bring a number of these into the schoolroom and 

 place in a terrarium or box. Keep supplied with fresh 

 leaves. 



How do they eat the leaves ? What kind of mouth parts 

 must they have? The children will readily see that they 

 must have biting jaws in order to make holes in the leaves 

 as they do. Place the worms on fresh leaves and let the 

 children notice how they eat. 



How do they move about? Make out the number of 

 feet they have. Are all the feet of the same size and shape ? 

 The three pairs near the head are the true legs, the four 

 near the middle and the one at the hind part of the body 

 are pro-legs. 



Watch the larvae closely when they leave the leaves 

 and crawl up the side of the cage. They are now getting 

 ready to change into pupae. How do they fasten them- 

 selves to the support? Notice the little bit of silk at the 

 hinder part of the body and the thread of silk around the 

 middle. 



