68 DUST AND ITS DANGERS. 



were present, but had not yet set up even a 

 local disease. 



It has been shown, by a careful series of re- 

 cent observations, that when due care and 

 intelligent cleanliness are provided for, the at- 

 tendants upon consumptives in hospitals and 

 in private houses, are not subject, in any 

 marked degree to the acquirement of the dis- 

 ease. But, on the other hand, it has been 

 equally fully proven that when proper cleanli- 

 ness is not exercised, and the expectoration of 

 the patients not intelligently cared for, the 

 attendants in hospitals for consumptives have 

 with notable frequency fallen victims to the 

 disease. 



More proof than is in our hands is hardly 

 needed that in a very large proportion of cases 

 in inhabited regions the infective agent or germ 

 of tuberculosis is conveyed from sick to well per- 

 sons by means of the material discharged from 

 the lungs, which is allowed, from carelessness 

 or ignorance, to dry and finally mingle with the 

 floating dust. 



While thus tuberculous persons may be a 

 constant source of danger to their healthy fel- 



