112 



MOSQ UI TO ERA DICA TION 



In the project above-mentioned, nearly 40 miles of ditches 

 were dug, a large proportion of them being in the swamp alluded 



Fig. 73. — Above, 

 lagoon completely 

 cost less than $50. 



(Photos by E. B. Johnson, C. E.) 

 lagoon that was a bad Anopheles breeding-place; below, 

 dried up. This was accomplished by a ditch that 



to. The cost averaged $723.05 per mile or 13.7 cents per lineal 

 foot. 



