294 NATURE-STUDY REVIEW [15:7— Oct., 1919 



11. If they save thenivselves from falling by a silk threads 

 observe from whence the silk comes. 



12. On how many kinds of trees do you find these caterpillars? 

 Learn the names of the trees and draw pictures of the leaves of 

 the different trees. 



13. How do the caterpillars injure the trees? 



14. Why cannot a tree live without leaves? 



15. Describe a caterpillar as it appears about the middle of 

 June or make a drawing of it if you like. Has it any coral color 

 except on its head? How many tussocks has it on its back 

 and what color are they? See the peculiar hairs which make up 

 the three long black plumes. Look at a single one of these 

 feathery hairs under a microscope if possible. Where are the long 

 black pltimes on the caterpillar? 



16. Count the caterpillars in the cage and then count the leaves 

 eaten by them and see how many leaves a single caterpillar will 

 destroy. 



17. Let the teacher give a number lesson based upon the 

 reasonable supposition that from the egg mass of one mother 

 moth 200 caterpillars hatch and mature and that 100 of these in 

 tiim are mother moths and each deposits eggs that will produce 

 200 caterpillars the year following. 



Summer Work 

 Give the pupils the following outline to be completed when school 

 begins in the fall. 



1. Watch a tussock moth caterpillar make its cocoon and tell 

 how it is done. 



2. Gather many cocoons and place them in pasteboard boxes 

 and note what comes out of them in the spring. 



3. In September find some cocoons which have no egg masses 

 upon them and put these in paste board boxes and see what comes 

 out of them. If you find some small black insects that look like 

 flies coming from the cocoon, note that they have four wings like 

 bees instead of two wings like flies. The young of these insects 

 have destroyed the pupa in the cocoon and they are therefore our 

 friends and should be allowed to go free. 



4. Watch carefully during the summer and see what birds feed 

 upon the tussock moth caterpillar. 



5. Watch carefully for caterpillars in September and October — 

 to discover if there may be a second brood as there is in the South . 



