THE RAT PROBLEM 185 



PRACTICAL PROBLEMS 



The practical laboratory work of this section shall consist in 

 actually exterminating rats and mice from your home premises. 



Make a complete survey and locate every rat hole in the 

 ground and in. the walls of buildings, and draw a careful 

 diagram with all holes located. Stop all holes with earth 

 and mark on your diagram in red ink all that are reopened. 

 Locate on your diagram also rooms or buildings of rat-proof 

 construction. 



Make as complete a collection of rat and mouse traps as the 

 neighborhood affords. It will be well to have each member of 

 the class bring in all the traps he has used at the end of this 

 campaign, and compare and discuss the merits and demerits 

 of different traps. 



Devise and construct a better rat trap than any used. 



Write a brief statement of your own experience in clearing 

 your home of these pests. . 



