INDEX. \ 1 3 



PAGE 



Tubercle bacilli in expectoration in tuberculosis of lungs ... 60 

 " " the bodies of apparently healthy persons ... 67 



mode of action in causing consumption . . .60 



not easily killed by drying . 65 



spread of, by diseased meat and bad milk . . .64 



the sole direct cause of consumption . . 59 



vulnerability of, when growing with other germs . . 64 



Tuberculoss 55* 5$ 



" bacilli of, mode of action in causing .... 6 



" frequency and mortality of . . . . 61, 62 



heredity of 59 



" in other parts of the body than the lungs . .60 



" localized 6 7 



M mode of transmission of . . 64 



41 predisposition to . 59 



" spread of, by meat and milk . . .64 



* M ii * dust ....... 5 8 



Tucker, air analysis by . . . . 2 3i 3 1 



Typhoid fever 55 



Vacuum Cleaners ......... 79 



Ventilation, effects of, on floating dust ...... 28 



Vigilance necessary to prevent spread of bacterial diseases . . .90 



Webster's definition of dust ....... 3 



Wind, effects of, on floating dust and germs . . . . . a 



Yeasts 7 



Yellow fever. & 



