FIELD WORK. 17 



nesses and differences. What are the chief reasons for 

 the value of each? 



14. How many household animal pests can you men- 

 tion? To what animal groups do they belong? 



15. How many garden pests? What is the nature 

 of their work? 



1 6. What orchard pests are you familiar with? Give 

 a brief account of their habits. 



17. Find by examination, by conference with farmers, 

 by reference to the library, what animals are most in- 

 jurious to corn in the various stages of its growth. Simi- 

 larly, to wheat; to the elm, to the currant, etc. 



18. Can you think of any animals that would fall 

 in a class of "semi-domesticated" animals. Enumerate 

 and discuss. 



