631 
phenomenon is observed in purely chemical reactions, and is called 
“induction” 5). 
For my experiments [ used again suspensions of spores. Of every 
sample, selected at definite intervals of time, 4—5 parallel cultures 
were plated, of which I took the average. If the numbers did not 
mutually agree the experiment was considered to have failed. 
of survivors. 
Logarithms of concentration 
Minutes 
Fig. 1. Disinfection of anthrax spores by heat. 
TABLE I. Anthrax spores at 80°. 
| 
| 
| 
| 
| 
Time Numbers on plates ‘Number Starting 
; a Mean \Dilution, number | logo 
(min.)| 4 a i ae os Ds per EG | =1000 
440 | 422 | 456 | 454 | 454 445 | Il 4895 1000 | 3.000 
3 431 | 435 | 408 454 448 435 Lie | 4185 977 | 2.990 
6 | 366| 343 | 365 | 386| 406] 373 {1 || “410s |) ass .|. 22928 
10 | 597] 604] 605| 614| 613; 607 |. 6 | 3642 | 744 | 2.872 
20 | 724| 756) 665 | z20| 788| 732 | 3 | 2196 | 449 | 2.652 
30 | 935 | 950] 937| 946| 921| 938 | 2 | 1876 383 | 2.583 
50 | 1159 | 1081 | 1077 | 1022 | 1024] 1073 | 1 |. 1073 219 | 2.340 
1) Bunsen and Roscoe, Pogg. Ann. Bnd. 96, 1855, 
