12 
Tufa {Tuffhoden) rubbed up with plague bacillus. 
Marly loam {Loss) rubbed up with plague bacillus. 
Time. 
Moist. 
Drv. 
Over 
H 2 SO 4 . 
Remarks. 
1 day 
_L 
+ 
_ 
3 davs 
4- 
— 
5 days 
+ 
8 days 
_L 
12 days 
+ 
16 days 
+ 
20 days 
4 * 
25 days 
+ 
30 days 
+ 
40 days 
+ 
50 days 
_L 
60 days 
_ 1 _ 
From these tables it follows that the bacillus of plague withstands 
drying badly, while it remains alive a long time in moist conditions. 
Only in room dust did it die quickly under moist conditions. After 
two months, even under moist conditions, the number of bacteria was 
very much diminished. In addition to the test with dust, etc., a series 
was made with fabrics. 
Square pieces of linen, wool, silk and filter paper (1 cm. square) were 
sterilized and saturated with a bouillon emulsion of culture. - They 
were placed in Petri dishes and were exposed in the desiccator and in 
the room. Those that were to remain moist were placed in test tubes 
in the moist chamber. 
