DISCRETION 75 



arise that the workmen drop black oil about the 

 houses, or on the premises ; they must be exhorted to 

 be careful of such complaints. Or the lids of the cess- 

 pools may not have been properly screwed down, or 

 the servants have been insulted, etc. ; there are fre- 

 quently such grievances when the campaign first 

 starts. Such complaints must be inquired into, and 

 the foremen should be held responsible. But such 

 opposition wears off as the men learn their work and 

 the mosquitos disappear. In laundries the masters 

 sometimes grumble at the tubs being emptied. The 

 soapy water is used over and over again, and if they 

 are emptied out when most required, it gives extra 

 trouble. Arrangements must be made to suit the 

 convenience of such trades, and the masters can be 

 asked to dry out their tubs on Saturday nights, 

 when the work of the laundry is finished for the 

 week. These difficulties can always be overcome by 

 a little patience. Discretion must be employed. 

 There is no need to pour oil into tanners' vats, for 

 example ; nor to empty wine and vinegar jars ; nor 

 to oil gas-engine circulating cisterns the water in 

 them is too hot for mosquito larvae, and the oil is 

 liable to choke the engine. 



If there is a large separate native location it should 

 not be neglected. But in some countries the natives 

 may give trouble. This is often due to political 

 agitation. Sanitary measures among natives in India, 

 Egypt, and in other countries have given, and may 

 again give, rise to riots. The best way to avoid this 

 is to copy the methods employed on the Suez Canal. 



