MAN'S IMPROVEMENT OF HIS ENVIRONMENT 375 



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This map shows how cases of tuberculosis are found recurring in the same locality 

 and in the same houses year after year. Each black dot is one case of tubercu 

 losis. 



Heating. Houses in the country are often heated by open 

 fires, stoves or hot-air furnaces, all of which make use of heated 

 currents of air to warm the rooms. But in the city apartments, 

 usually pipes conduct steam or hot water from a central plant to our 

 rooms. The difficulty with this system is that it does not give us 



