STUDIES OF INSECTS 41 



3. Respiration and air sacs of insects. Use of air sacs 

 in flight. 



4. The heart and blood of insects. How the function 

 of the blood differs from that of other animals, as man. 



5. Special senses of insects : their character, location, 

 and efficiency. 



6. .Sound-making organs of insects. 



7. Power of communication among insects, as among 

 ants, for example. 



8. Organs for depositing eggs, ovipositors. How they 

 vary. 



9. Homes of insects. Evidences of architecture in 

 some of the homes. 



10. How some plants make homes for insects. Galls 

 and gall insects. 



11. In what various ways do insects survive the winter ? 

 Illustrate with examples. 



12. Community life among insects. Types of commu- 

 nities. 



13. Pollination of flowers by insects. Why insects do 

 this work and how the flowers compel them to do it in the 

 right manner. Value to the plants. Types of insects 

 useful for this purpose. 



14. Adaptations for protection against enemies. Clas- 

 sify these adaptations and illustrate with examples. 



15. The principal insect pests of the orchard and their 

 work. 



16. The principal insect pests of the garden and the 

 work of each. 



17. The principal insect pests of shade trees and their 

 characteristics. 



18. The principal insect pests of the household and 

 methods of extermination. 



