INTRODUCTION Xlll. 



Merchants' Association to abate this dangerous insect in our 

 midst. The subjection of the house-fly is as possible as that 

 of mosquito, compared with which it is equally dangerous 

 and far more so in populated areas. A complete study of 

 the life-history of the larvae and of the breeding habits of 

 the fly has given the key to the methods of prevention and 

 remedy. The solution of the evil has been given ; it remains 

 only for medical officers of health and those in whose hands 

 the health and well-being of the people is entrusted to apply 

 these results. Sufficient words of advice and warning have 

 been spoken, action is needed. 



C. GORDON HEWITT. 

 OTTAWA, 



January, 1910. 



