THE BACTERIA (SCHIZOMYCETES) 



177 



dwelling places ; to insure a pure and well-kept supply of milk 

 and water ; to keep vegetables and other foods that are handled 

 in public places free from dust and flies and promiscuous 

 fingering; thoroughly to disinfect all known or suspected 



FIG. 151. A chart illustrating the number of deaths from typhoid fever 



before, during, and after the introduction of improved systems of sewage 



disposal and water supply 



Five prominent cities of the world are selected. The figures indicate the num- 

 ber of deaths per each 10,000 inhabitants. Rearranged from a chart in Abbott's 

 Hygiene of Transmissible Diseases 



