NATURE-STUDY LESSON'S. 75 



The envelopes spun by larvre and in wliich they enclose themselves are 

 called cocoons. 



2. {a) Describe the cocoon, its shade, color, length and 

 breadth. 

 (J}) Note how it is attached to the twig. 



3. («) Examine an empty cocoon. 

 {b) Describe the outer wall. 



{c) Remove this and describe what is underneath. 

 {d) Remove the second covering and describe the 

 inner cocoon. 



4. What are the advantages of such an arrangement of 

 the coverings ? 



5. Compare the way in which the fibres are woven at 

 the small and large ends. 



6. (a) Open a tenanted cocoon. 

 {b) Describe what it contains. 



The inactive form of this as well as of many other insects enclosed in a 

 cocoon and from which the perfect insect emerges is a chrysalis. 



7. (a) Watch a moth escaping from the cocoon and 



describe what is taking place. 

 (p) At which end of the cocoon does it escape? 



8. How are the fibres softened to allow the moth to 

 pull the threads aside? 



9. What advantage to the insect is it to have the fibres 

 of one end more loosely woven than at the other end ? 



