MICROORGANISMS AND SANITATION 383 



In most cities there is a special "street cleaning" depart- 

 ment which attempts to have all rubbish and garbage re- 

 moved from the streets before it begins to decay so that 

 there may be nothing lying about of obnoxious or disease- 

 breeding character. 



In many ways the city authorities can regulate conditions 

 so that fresh air, pure water and pure food are assured to 

 the community, but it is the duty of each citizen to have an 

 intelligent knowledge of the laws of hygiene and sanitation, 

 not only that he himself may run no risks but that he may 

 not be the cause of any risks to his neighbor or to the 

 community. 



