1‘2 
ther:vial death point. 
AVe had abundant opportunity in our work in making Hatfkine pro- 
phylactic in demonstrating- that a temperature of 70^ is invariably fatal 
in a short time. 
The following’ table shows the maximum number of davs we have 
kept the organism alive on the objects used in these experiments, and 
the temperatures under which the experiments were conducted. The 
table shows at a glance how frail an organism the bacillus pestis is at 
the body temperature. At 22^ to 29° C. it shows much more resistance. 
At 17° to 19° C. it lives a verv long time, even when drv. 
TABLE A. 
^[aximum number of days the jdagne hacillus Jived on the various ohjerts at different 
temperatures. 
Temperature. 
37° C. 
22° to 29° C. 
17° to 19° C. 
Days. 
Days. 
Days. 
Gelatin culture in albiunin-gelatin balls 
75 
112 
Agar suspension in — 
Tap water 
6 
71 
116 
Water 
6 
71 
96 
Bouillon culture on — 
Paper, drv 
0 
3 
8 
Paper, moist 
8 
14 
Wood 
0 
0 
0 
Sawdust 
0 
0 
2 
Wool 
52 
Flannel 
3 
3 
3 
Sponge, drv 
2 
97 
125 
Garden earth, drv 
1 
1 
1 
Garden earth, moist 
14 
84 
93 
Bone 
1 
6 
17 
Agar suspension on bone dust — 
Drv 
1 
6 
Moist 
125 
lOS 
125 
Bouillon culture on crash 
0 
■ s 
97 
Cultures on carpet and plush 
0 
0 
0 
Milk inoculated udth plague 
49 
68 
32 
Bouillon culture in — 
Cheese 
17 
17 
13 
Butter 
5 
55 
-72 
Cultures on fig-s and raisins 
0 
0 
0 
Bouillon culture on — 
Salt beef _■ 
3 
Orange peel 
0 
Eice 
0 
3 
18 
Large varietv of Chinese food products 
• 3 
Spleen of plague rabbit 
45 
1 
65 
Plague blood on — 
Filter paper 
0 
6 
Crash 
0 
4 I 
1 
Sponge 
0 
j 
9 
Wood r. 
0 
6 
