300 



BULLETIN No. 161 



[November, 



TABI,E 6. Continued 



Author 



Date 



Conditions 



Not killed Killed 



Cornet 27 

 Feltz 38 



Sawitsky 128 



Stone 140 

 Koch 72 



Maffucci 90 



Marpmann 92 



Ransome and 

 Delepine 114 



Hance 53 



Kirchner 68 



1889 

 1890 



1891 



1891 

 1892 



1892 



1893 

 1894 



1895 



1895 



Dust samples examined for tubercle 

 bacilli were found positive: 



In hospitals 



In insane asylums 



In dwelling" houses 



Dried tuberculous sputum in road dust: 



Exposed to weather 



Exposed to sun 



Dried sputum, in rooms 



Tuberculous sputum dried under or- 

 dinary conditions and exposed in 

 the dark in living- rooms 



Same exposed to sunlight 



Dried tuberculous sputum, only de- 

 creased in virulence 



uinea pigs were inoculated with 

 tuberculous sputum dried for 2 

 weeks, for 4 weeks, and for 8 

 weeks. In each case tuberculosis 

 developed as with fresh material. 



Pure culture of avian tubercle bacill 

 dried on silk threads, inoculated 

 into a hen abdominally 



Same repeated. Hen not tuberculous 

 abdominally; one tubercle in the 

 lung 



Tubercle bacilli frequently found in 

 street dust by microscopic test . . . 



47.6 percent 



17.6 



43.6 



over 7 mp. 

 about 140 

 days 

 7 to 9 mo. 



2Y 2 mo. 

 2y 2 mo. 



3 yrs. 



2 to 8 wks. 



14 days 



2 mo. (?) 2 mo. (?) 



19 days 



19 days 

 45 days 



Tuberculous sputum exposed in watch 

 glasses: 



To air and light 4 days; then 15 

 days in the dark 



To air and light 8 days; then 11 

 days in the dark 



In closed cupboard 



In dark air shaft, produced slight 



tuberculosis in a rabbit 



The author, under the direction of 

 Dr. Trudeau of the Adirondack 

 Cottage Sanitarium, examined 81 

 samples of dust from the differ- 

 cottages. Four guinea pigs died 

 too early to make the test for tu- 

 bercle bacilli; of those remaining 

 5, or 4.9 percent, became tubercu- 

 lous. These were from a group 4.9 percent 

 of 10 guinea pigs inoculated with 

 the dust from one small cottage. 

 The author later inoculated 9 



f uinea pigs with dust from a New 

 "ork hospital, 5 of which died in 

 3 days, and 1 of the 4 remaining 



became tuberculous 



Fourteen guinea pigs were inoculated 

 with 7 samples of dust from rooms 

 in homes of consumptives; 9 

 guinea pigs died early and 5 re- 

 mained healthy. In a second ser- 



25 percent 



19 days 



all killed 



