MODES OF TRANSMISSION 



IQI 



not used and there is no chance of infection, with bacteria, 

 of the water supply. Unless the right species of muscids, 

 not Musca domestica, are present, they are very offensive. 

 Burial in trenches some 3 ft. deep and covering with 

 1 8 in. of earth is in most places the most suitable method. 

 Public latrines must be provided for all gangs of labour 

 and these must be sufficient to accommodate at one time 

 at least one-sixth of the average strength. With inade- 

 quate latrine accommodation the most dangerous system 

 of all namely, defaecation in cultivated grounds or 

 amongst the rank vegetation near water is bound to 

 occur. With adequate latrine accommodation and water 

 for ablution purposes conveniently near, 'there is little 

 difficulty in enforcing the use of these conveniences. 



TABLE INDICATING BRIEFLY THE MODE OF INFECTION. 



