38 
Xo. 77. — Plague Blood ox Wood. 
Small sticks of white pine were sterilized by heat and soaked in the 
heart’s blood of a rabbit dead of experimental plague and left to dry 
in a Petri dish in the cold room at 17^ to 19^ C. 
Time. 
Result. Remarks. 
1 day 
6 days 
-r 
9 days 
— 
12 days 
— 
18 days 
i 
Plague Blood ox Ceash, Paper, Spoxge, axd Wood at 37° C. 
Small pieces of crash, white filter paper, sponge, and white pine were 
sterilized and soaked in the heart’s blood of a rabbit dead of experi- 
mental plague and kept in the incubator at 37° C. 
XO. 78. 
1 Object. 
Time. 
Result. 
I Crash 
5 days 
! 
Do 
14 days . . . 
XO. 79. 
Paper 
5 days 
14 days . . . 
1 
Do 
! XO. 80. 
i 
Sponge 
Do 
5 days 
14 days . . . 
‘ 
— 
XO. 81. 
Wood 
Do 
5 days 
14 days . . . 
— 
PLAGUE EXPOSED TO SUNLIGHT. 
Plague when exposed directly to bright sunlight died quickly. Even 
in a piece of sponge it could not live an hour in the bright sunlight of I 
a Washington day in the month of IVIay. When exposed more directly ‘ 
on the surface of objects it died within half an hour. 
The sun, however, could not penetrate small pieces of plague spleen , 
in five hours. 
