306 



BULLETIN No. 161 



[November, 



vii 6 Continued 



Author 



L/eNoir and 

 Camus 85 



Verdozzi 15 



Rickards, 

 Slack 

 and 

 Arms 119 



L/eNoir 



and 



Camus 82 



Date 



1908 



1909 

 1909 



1909 



Conditions 



Not killed 



for 10 days to the sun; and the 

 second in the shade for the same 

 time. A series of 5 guinea pig's 

 was inoculated from each sample. 

 In each case 4 of the test animals 

 died of acute infection within a 

 few days; the other lived 17 days 

 and then died of an unknown dis- 

 ease. Neither became tubercu- 

 lous 



The nasal cavities of non-tuberculous 

 persons, living' in a room with 

 consumptives, were washed with 

 wet cotton swabs and this ma- 

 terial inoculated into guinea pig's. 

 Of 9 guinea pigs thus inoculated 

 2 died with abscesses and the other 

 7 remained healthy. 



Further investigations were carried 

 out on consumptives. Of 13 guinea 

 pigs inoculated 3 showed tuber- 

 culous changes. 1 



Dust from the library at Rome pro- 

 duced tuberculosis in rabbits. 



Tuberculous sputum was placed on 

 small strips of carpet and wooden 

 tongue depressors and exposed in 

 tenement houses in Boston: 



To diffuse daylight 



In the dark 



To the sunlight 



The same exposed in the Boston 

 Health Laboratory: 



In diffuse daylight, on carpet 



In diffuse day light, on wood: 



Positive 



Negative 



In the dark exposed in the air on 

 carpet: 



Positive up to 



Negative then till 65 days 



At this time (65 days) two speci- 

 mens rubbed together were posi- 

 tive 



On wood no end point was reached. 



Samples were positive up to . . 

 Ten rabbits in one box and 4 in an- 

 other were placed in a tuberculous 

 hospital, and arranged so that 

 they could breathe only dust-laden 

 air from the rooms with tubercu- 

 losis patients. Four of the 10, and 

 2 of the 4 rabbits were found to 

 be tuberculous when examined 6 

 weeks later. 



3 to 10 days 



10 to 14 days 



6 hrs. 



19 days 

 31 days 



35 days 



65 days 

 88 days 



Killed 



10 days 



after 19 to 

 57 days 



5, 29, 32 

 days and 

 afterward 



36 to 65 days 



a Tuberculosis in these cases was more likely produced by fresh tubercle 

 bacilli from the patient than from dust breathed by the patient. 



