PREVENTION BY FARMING METHODS 2$ 



sary to keep the insect down, unless by carelessness it were 

 permitted to return unmolested to its old haunts. Immeasurable 

 benefits would undoubtedly accrue by the subordination of self- 

 interest for the common weal. Indeed this subordination is only 

 apparent and it has been pointed out that one of the best, as it 

 is the noblest, methods of self-help consists in helping our 

 fellow men. 



Fig. 2I3'.— A simple coal-tar pan to be drawn by hand 1 After Riley) 



