84 DUST AND ITS DANGERS. 



there is no general protest against the careless- 

 ness or ignorance which is displayed in the 

 so-called cleaning of these places, seems almost 

 incredible when the importance of the matter 

 is once realized. In the same deplorable con- 

 dition are many of the public school-rooms in 

 both large and small towns. Ventilation is 

 slowly becoming recognized as important, but 

 the removal of dust, which in crowded places 

 is very liable to be infectious, is not systemati- 

 cally attended to. 



Public conveyances into which, especially in 

 this country, people are huddled indiscrimi- 

 nately, are very rarely properly cleaned and 

 dusted. Of course, in these it is not the ordi- 

 nary inorganic dust, the fine coal or iron or 

 sand particles which are most to be dreaded, 

 but the materials which come from uncleanly 

 travellers who are the victims of bacterial dis- 

 ease. The dangers will be removed only when 

 the travellers themselves realize that the dis- 

 gusting and very prevalent habit of spitting 

 upon the floor of public conveyances is not 

 only filthy but may be positively dangerous, 

 and the managers of the transportation com- 



