' [Vor. 7 
268 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Bacteria per cc. 
(Logs. ) 
9.0 
- — Vago OER Be id ea EN 
e, 
8.0 
7.0 
8.0 
5.0 
Py 
4.0 
5.0 j j 
A 
ES ALL [LA 
VAM AS V. 
TM Ki TN > ER E N ===> 
EN LJ- eed 
8.0 
9.0 
Hours o 48 96 144 192 240 
Fig. 5. Growth and hydrogen ion concentration of Bacillus coli at 30° C., plain 
and 1 per cent dextrose bouillon, neutralized at intervals. 
plain bouillon. 
— — — — 1 per cent dextrose bouillon. 
