CARRIAGE OF DISEASE 159 



from a neighboring dust-bin or manure heap, or from 

 the liquid stools of a diarrheal patient in a neighboring 

 house. Flies have to be picked out of the half-empty 

 can of condensed milk before its remaining contents 

 can be used for the next meal.' Newsholme considers 

 the greater prevalence of diarrhea among infants fed 

 on Nestle's milk as due to the fact that flies are more 

 attracted to it than to ordinary cow's milk because of 

 its sweetness. 



"Copeman (1906, p. 18), in a report to the Local 

 Government Board dealing with epidemic prevalence of 

 infantile diarrhea at Wigan, says : *At the Miry Lane 

 Depot there is always stored (awaiting removal by 

 farmers) an enormous amount of night-soil mixed with 

 ashes which, in hot weather especially, is not only ex- 

 ceedingly offensive, but is beset by myriads of house 

 flies. As the result of personal enquiry at the various 

 houses in the neighborhood in which, during the year 

 1905, deaths from diarrhea had occurred, I learnt that 

 considerable nuisance from the foul odors was apt to 

 be experienced during the prevalence of hot weather, 

 especially with the wind In the south or southwest, /." c, 

 blowing from the Depot to the special area, so much 

 so on occasions as to render it necessary to shut all the 

 windows, while the Inhabitants of houses nearest the 

 Corporation Depot stated that at certain times of the 

 year their rooms were apt to be Invaded by a veritable 

 plague of flies, which swarmed over everything of an 

 edible nature on the premises. This being so, it would 

 appear not improbable that these flies, some of which 



