SUMMARY AND CONCLUSIONS 263 



suitable conditions may distribute disease-producing bacteria 

 (Chapter xxvi). 



Flies which enter houses may be caught on papers or in traps, 

 or may be destroyed by other means. In order to limit their 

 numbers, however, the breeding places must be removed or 

 rendered unsuitable. This can only be accomplished by edu- 

 cating the community, establishing inspectors, and enforcing 

 bylaws framed to meet the needs of different localities 

 (Chapter XXVI I ). 



The filth-carrying capacity and foul associations of the 

 house-fly have been clearly demonstrated, but prolonged and 

 careful observations are yet required before we are in a position 

 to understand its exact relationship to disease under varying 

 conditions. For the elucidation of some of the problems, which 

 have been indicated, expert knowledge is required, but accurate 

 observations by workers without special scientific training would 

 be of the greatest assistance. The writer hopes that those who 

 are interested in public health matters, both at home and abroad, 

 will be able to gather from these pages some information, which 

 may be useful to them in planning investigations on the widely 

 scattered problems opened up by the demonstration of the 

 capacity of non-biting flies to disseminate disease-producing 

 micro-organisms. 



