62 EARLY FLY-REDUCTION 



some towns, the organiser of the fly-campaign may 

 consider it more convenient to have a permanent gang 

 of labourers under each fly-inspector to destroy fly- 

 larvae, as is now done in the case of mosquitos. These 

 gangs would then constitute fly-brigades, and they can 

 be managed in exactly the same way as described in 

 " The Reduction of Domestic Mosquitos." But in 

 civilised countries, at any rate, it is much better to 

 educate the people themselves to undertake anti-fly 

 measures. The townsfolk will soon become alive to 

 the danger of these insects, and will know how to 

 prevent them. 



Once a year a report should be furnished to the 

 sanitary authority by the organisers of the anti-fly 

 campaign in which is related the progress made. These 

 reports should be a continuation of the original 

 memorial submitted when the campaign was started. 

 It should contain lists of the fly-breeding places, and 

 comparisons must be made between now and then ; 

 the number of actual fly-lairs mentioned in the pro- 

 gress report can be compared with the number 

 mentioned in the first report. Thus a rough calcula- 

 tion of the fly-reduction can be made and reported. 

 Suppose that there were 1,000 fly-lairs found within 

 a certain area at the outset of the campaign, and 

 this number was reduced by half after one year's 

 progress, then a certain advance has been made. The 

 annual reports can also give details of the fly-borne 

 disease-incidence. State the facts. It may require 

 years of continuous fly-reduction to reduce the disease- 

 incidence so obviously as to show clearly in the 

 returns; and even if there is an apparent increase of 

 disease at first the campaign must be persevered with. 

 For only in large populations where there is a con- 



