37 
No. 74 . — Pl.\gue Blood ox Sponge. 
Small pieces of sponge were sterilized hy heat and impregnated 
with the heart’s blood of a rabbit dead of experimental plague and 
kept in a Petri dish in the cold room at 17^ to C. 
Time. 
Result. 
Remarks. 
1 (lay 
+ 
6 (lavs 
+ 
9 (laws 
-f 
12 (lavs 
— 
18 days 
— 
Contaminated. 
31 days 
— 
No. 75 . — Plague Blood on Crash. 
Small squares of crash were impregnated with the heart’s blood of 
a rabbit dead of experimental plague and kept in the cold room at 17° 
to 19° C. 
Time. 
Result. 
Remarks. 
1 (lav 
+ 
Contaminated. 
6 days 
— 
9 days 
— 
12 days 
- 
18 davs 
— 
No. 76 . — Plague Blood on Paper. 
Small slips of sterilized white filter paper were impregnated with 
several drops of the heart’s blood of a rabbit dead of experimental 
plague and exposed in the cold room at 17° to 19° C. 
Time. 
Result. 
Remarks. 
1 (lav 
+ 
G davs 
-f 
9 davs 
- 
12 davs 
— 
18 days 
— 
34 days 
— 
