'45 



Occupation. 

 Miners .... 

 Engineers, mechanics, &c. 

 Clerks, shop assistants, &c. 

 Housewives, domestic servants, &c, 

 Dock liibourers, &c. . 

 Farm labourers 

 Metal workers . 

 Spinners and weavers 

 Carters 



Eailwaymen, porters 

 Stone-workei's, &;c. . 

 Labourers 

 Butchers . 

 Glass-workers . 

 Chemical workers • 

 Carpenters, &c. 

 Bootmakers 



Packers, warehousemen 

 Schoolboys 

 Sanitary worker 

 Fisherman 

 Tailor 

 Gardener . 

 Grocer 

 Greengrocer 

 Miller 

 Baker 

 No occupation (paupers) 



No. 

 17 

 13 

 8 

 6 

 5 

 i 

 i 

 i 

 4 

 3 

 8 

 3 

 3 

 2 

 2 

 2 

 2 

 2 

 2 



Total 



100 



I give these figures for what they may be worth. They do not, 

 unfortunately, give us any indication of th^ relative frequency 

 of infection among different classes of workers : but they are of 

 some interest in other ways. For example, the fact that E. 

 histolytica occurs among domestic servants, bakers, butchers, 

 grocers, and other persons who habitually handle food, suggests 

 possibilities which cannot be ignored in considering the spread of 

 infection through the community. (Cf. p. 54 infra.) 



On general grounds one would expect E. histolytica and other 

 intestinal protozoa to occur most frequently among people who 

 live under the most insanitary conditions. Prompt and efficient 

 disposal of faeces, and great personal cleanliness, would certainly 

 limit the spread of infection. It is scarcely surprising to find 

 that farm hands and dockers are infected, and nobody is likely to 

 be astonished at seeing a ' sanitary worker ' in the above list. It is 

 unfortunate that no figures are available to indicate the incidence 

 of infection among these various classes, and among groups of 

 persons belonging to higher social strata. It will be remembered 

 that practically all the persons hitherto studied belong to the 

 labouring and artisan classes ; and consequently all the carriers 

 found are of the same status. 



The large number of miners in the list will be noted, and this 

 record is of particular interest. The infected individuals were 

 mostly found by Matthews and Smith in a series of colliers. In 

 this series, consisting of 78 men, no less than 10, or 12-8 per cent., 

 were found to be infected with M histolytica. All the infected 



