VALUE OF BIRDS TO AGRICULTURE 



305 



2. Bird Boxes 

 Each pupil should make a bird box, according to some 



design of his own choosing, and bring it to school to 

 show .the teacher and the rest of the class. Take the 

 box home and put it up out of reach of the cat in some 

 attractive place where the birds can build in it. It 



FIG. 93. MARYLAND YELLOW-THROAT 



would be well to make some bird boxes for the school 

 yard also. 



Problems 



1. Suppose that the damage from insects in your 

 state is 25c an acre. How much would that be for the 

 whole state? 



