DUST AND ITS DANGERS. 65 



the use of uncooked meat or milk. That the 

 consumptive mother may infect the nursing 

 child with its food has been abundantly proven. 

 There are cases in which the tubercle bacilli 

 get into the blood and are distributed to all 

 parts of the body, setting up such innumerable 

 foci of disease that the individual soon suc- 

 cumbs to the violence of the poison. 



But after all, the prevailing seat of consump- 

 tion being in the lungs, the most natural 

 supposition is that the larger proportion of 

 consumptive people become infected through 

 the inhaled air. 



Now, as has been absolutely proven over 

 and over again, in almost all populous regions, 

 both out-of-doors and in-doors, tubercular per- 

 sons may be discharging thousands of living 

 tubercle bacilli every time they spit out mate- 

 rial from their lungs upon the streets, or upon 

 the floors, or wherever it can dry and mingle 

 with the dust. If the tubercle bacillus is not 

 easily killed by drying, as has been fully proven, 

 have we not a sufficient explanation of the way 

 in which the infection of tuberculosis becomes 

 so widely and perpetually spread ? 



