634 
performed with the greatest caution. Our results however, as may 
G2) 
of 
Logarithms of concentrations of survivors 
Minutes 
Fig. 2. Disinfection of Bac. coli. 
A, B, and C are different cultures. 
be roughly concluded from the table are most likely not more in- 
accurate than those of other investigators on this subject. 
TABLE II. Disinfection of B. coli (culture C) by heat at 47.5°. 
| 
| Numbers on plates | Starting 
enk | 
es i 55 — — \eMean., (number) oei 
RAE done SL = 1000 
1 | 2016 | 2086 | 2100 2035 2059 | 1000 | 3.000 
3 | 1547 | 1495 | 1558 | 1498 | 1525 | 740 | 2.869 
6 | 211 | 270) 221 | 288| 248 | 120 | 2.079 
102 | 129] 137: 132| 125 | 61 | 1.785 
20. |. Oo) HO 105 see ee HEE 
30 66| 80| 65| 65 69 33.5 | 1.525 
Disinfection of B. coli with phenol also yielded types of loga- 
