58 STUDIES OF ANIMAL TYPES 



field or plants may be grown in the house for the cater- 

 pillars to eat. 



The eggs are laid throughout the summer on the leaves of 

 cabbage. Obtain some, if possible, and see how long it takes 

 for them to hatch. The eggs are nearly white, conical, and 

 ribbed. They are large enough to be easily seen with the 

 unaided eye and are usually to be found in abundance. If 

 the eggs cannot be obtained, the pale green caterpillars may 

 be found eating the leaves and can be easily fed indoors. 

 They will grow rapidly. Observe the number of times they 

 molt. In two or three weeks each one will change to a 

 pupa. The pupa is known as a chrysalis. What color is 

 it ? Where is it placed and in what" position ? How is it 

 attached to the leaf? Watch the chrysalis and see how 

 long before the adult appears. How does the adult get out 

 of the chrysalis ? 



Watch all these stages and make notes on all the changes 

 and the time occupied in each stage. 



From this study of the life history of the cabbage butter- 

 fly, it is evident that it passes through remarkable and 

 distinct changes from the egg to the adult. In fact, there 

 are four distinct stages in the life history of this butterfly ; 

 namely, the egg, larva, pupa, and adult. An insect that 

 passes through such a series of distinct changes is said to 

 have a complete metamorphosis. 



C. TOPICS FOR FURTHER STUDY. Give a summary of 

 the life history of the butterfly. Give the characteristics 

 of its wings. Compare its mouth parts with those of the 

 locust. Make a diagrammatic drawing of its body to show 

 the three regions. Find out to what order it belongs. 

 Make a list of other insects belonging to the same order. 

 What is characteristic of all these insects ? 



