44 OTHER COMMON INSECTS 



we study the lower animals ; it helps us better to under- 

 stand ourselves, and to go forth better equipped to wage 

 our contest and win our fight. 



QUESTIONS 



Explain the difference between beneficial and injurious insects. 

 Which are some of our most beneficial insects ? How do they help 

 us? 



How did they help to save the orange industry of California ? 



How do fruit growers spray their trees ? Why ? 



What can you do to prevent harmful insects from spreading ? 



KEFERENCES 



Crary, Field Zoology, Chapter X. 



Folsom, Entomology with Reference to Its Biological and Economic 

 Aspects. 



Hegner, Introduction to Zoology, Chapter XII. 

 Hodge, Nature Study and Life, Chapter X. 

 Kellogg, Animals and Man, Chapter XV. 

 Osborne, Economic Zoology, Chapter XII. 

 Root, A. B. C. and X. Y. Z. of Bee Culture. 

 Smith, Our Insect Friends and Enemies. 



