For some years past a careful record has been kept of the method of feeding, not only of all children dying of epidemic diarrhoea, but also of all babies under one year of age in the houses of the working classes, which are visited year by year in the course of routine house-to-house inspections by the sanitary inspectors in my department. It is impossible to ask the necessary questions at every house, but in most houses information has been given without difficulty, and it may be taken as certain that the 1259 babies living in 10,308 houses who are classified in the first four columns of Table I belong approximately to the same social stratum as the 121 babies dying from diarrhoea who are classified in the four last columins of the same table.