INDEX. 



Air, amount of, used for biological analysis ..... 23 



" analysis, biological, methods of . . . . . 13, 19 



" " " filtration method of . . . .15 



41 " " plate method of ..... 15-18 



" bacteria of, as disease producers . . . . . . 52, 53 



" contaminated by tubercle bacilli in dust of . . . . .66 



41 effects of stirring of, in altering germ contents . . . .31 



" " 44 sweeping on ....... 31-33 



41 exhaled, freedom of, from dust and germs ...... 69 



vl filtration of, in ventilating shafts . . . . . 79 



14 in-doors, bacteria in . . . . . . -33 



14 * 4 dangers of, from floating dust . . . . .76 



44 " germs in . . . . . .27 



14 ' 4 origin of germs found in . . . . 3 



14 u spontaneous freeing of, from dust and germs . . .37 



44 " varying number of germs in . . . . . 34 



" modes of spontaneous freeing of, from dust and germs . . .31 



44 of theatres and other public places as sources of disease 81 



44 out-doors, varying number of germs in . . . . . 22, 23 



44 " spontaneous freeing of, from germs . . . .21 



41 probability that consumption is commonly transmitted through . 65 



11 street-, in cities, dangers of, from its floating dust . . .75 



44 4l in New York during cleaning . . . . . 25, 26 



Antaeus ..... l6 



Asiatic cholera ......... 55 



Bacilli ... 13 



44 -tubercle 4 



44 4i dangers from, in sputum of consumptives . . .61 



M habitat of &4 



l " in bodies of apparently healthy persons . . .67 



* ** " dust of rooms used by consumptives . .66 



107 



