THROAT ILLNESS AT HACKNEY 



357 



in distant parts of the parish in households supplied by X, but 

 where his milk was not expected to be supplied. In some of the 

 families where sore throats existed, the milk was boiled before use, 

 and where this practice obtained the sore throat disease was 

 milder or absent 



When the above returns were analysed, they showed that sore 

 throat illness had occurred amongst the customers of X in undue 

 proportions compared with other vendors, which could only be 

 attributed to some infective properties in the milk supplied, except 

 upon the hypothesis that X supplied 85 per cent, of the households 

 in the area from which these replies were received ; but this was 

 not so. Dr Warry divided the affected district into two areas, 

 A and B, and the result of his inquiries in these two sub-districts 

 was as follows : — 



(i) Area "A." 



(2) Area "B." 



