ECONOMY 109 



be economised by stocking them with fish or with 

 the water-beetle Notonecta, " the water-boatman." 

 Even when these exposed pools are oiled the wind 

 may bank it up, and then the mosquito larvae will 

 thrive. Advise the municipality to fill up such places 

 or to turn them into ornamental ponds, and put in 

 some goldfish. But in this case see that the fish do 

 not die ; examine them periodically. Make a fore- 

 man responsible for this. 



After the mosquitos have been reduced and the 

 work is well maintained, it will become apparent that 

 much labour would be saved if the cesspools were 

 filled up and replaced by an efficient system of 

 sewerage by water carriage ; also that a great eco- 

 nomy in water consumption would be effected, and 

 water-tubs and cisterns dispensed with by a good 

 filtered-water supply, if the pressure in the pipes could 

 be made sufficient to reach the top stories of the 

 highest houses in the town. If these could be Installed, 

 the cost of the mosquito campaign will fall consider- 

 ably. But it is quite unreasonable to delay the 

 institution of anti-mosquito measures until such 

 major sanitary works have been installed, for the 

 fever will continue. 



In one or two towns mosquito measures have been 

 said to have failed ; for example, at Mian Mir, in India. 

 This is because it was not properly or sincerely car- 

 ried out. If the work is perseveringly done, it is 

 bound to succeed. 



