38 
North Carolina Agricultural Experiment Station 
Table 10. —Influence of Different Amounts of Peptones Upon pH Concen¬ 
tration in Varying Concentrations of Dextrose. Initial pH 7.2 
Age of Cultures in Days and pH Concentrations 
in 2 and 4 Per Cent Peptone 
Days 
Organism 
Bacterium tabacum- 
Bacterium angulatum- 
Bacillus, carotovorus 
Bacterium glycineum- 
Bacterium sojae 
Concen- 
tration 
of 
Dextrose 
1 
3 
5 
7 
9 
Peptone 
Peptone 
Peptone 
Peptone 
Peptone 
2% 
4% 
2% 
4% 
2% 
4% 
2% 
4% 
2% 
4% 
Per Cent 
pH 
pH 
pH 
pH 
pH 
pH 
pH 
pH 
pH 
pH 
0.1 
7.2 
7.2 
7.0 
7.2 
7.4 
7.6 
8.0 
8.0 
8.4 
8.4 
0.3 
7.2 
7.2 
6.8 
6.8 
7.0 
7.4 
7.4 
7.8 
8.0 
8.4 
0.6 
7.2 
7.2 
6.4 
6.4 
6.4 
6.4 
6.8 
6.8 
7.2 
7.4 
1.0 
7.0 
7.2 
6.4 
6.4 
6.0 
5.8 
5.8 
6.2 
6.6 
6.6 
2.0 
7.0 
7.0 
6.4 
6.4 
5.4 
5.4 
5.2 
5.2 
5.0 
5.0 
0.1 
7.2 
7.2 
7.2 
7.2 
7.6 
7.8 
8.0 
8.2 
8.4 
8.4 
0.3 
7.2 
7.2 
7.0 
6.8 
7.2 
7.4 
7.4 
7.8 
7.8 
8.4 
0.6 
7.2 
7.2 
6.4 
6.6 
7.2 
7.2 
7.4 
7.6 
7.8 
8.0 
1.0 
7.2 
7.2 
6.8 
6.2 
6.6 
6.6 
6.8 
6.6 
7.2 
6.8 
2.0 
7.2 
7.2 
6.4 
6.4 
5.6 
6.2 
5.4 
6.4 
5.2 
6.6 
0.1 
6.8 
6.8 
6.6 
6.6 
6.6 
7.0 
7.4 
7.4 
7.6 
7.6 
0.3 
5.6 
5.8 
5.4 
5.6 
5.4 
5.6 
5.2 
5.4 
5.2 
5.4 
0.6 
5.6 
5.6 
5.4 
5.4 
5.4 
5.4 
5.2 
5.2 
5.2 
5.2 
1.0 
5.4 
5.6 
5.2 
5.4 
5.2 
5.4 
5.1 
5.2 
5.0 
5.2 
2.0 
5.4 
5.6 
5.2 
5.4 
5.2 
5.2 
5.1 
5.2 
5.0 
5.0 
0.1 
7.2 
7.2 
7.0 
7.0 
7.4 
7.4 
8.0 
8.0 
8.2 
8.2 
0.3 
7.2 
7.2 
7.0 
6.8 
7.6 
7.4 
8.0 
8.2 
8.4 
8.4 
0.6 
7.2 
7.0 
7.0 
7.0 
7.0 
7.6 
7.6 
8.0 
8.0 
8.4 
1.0 
6.8 
7.0 
6.2 
6.6 
6.0 
7.4 
6.4 
7.6 
6.8 
7.8 
2.0 
6.8 
7.0 
5.6 
5.8 
5.4 
5.4 
5.2 
5.2 
5.0 
5.0 
0.1 
7.2 
7.2 
7.2 
7.0 
7.6 
7.6 
8.0 
8.0 
8.4 
8.4 
0.3 
7.2 
7.2 
7.0 
7.0 
7.4 
7.4 
7.8 
8.0 
8.4 
8.4 
0.6 
7.2 
7.0 
7.0 
7.0 
7.4 
7 .,6 
7.8 
7.8 
8.2 
8.4 
1.0 
6.8 
7.0 
6.2 
6.6 
6.0 
7.4 
6.6 
7.8 
7.0 
8.0 
2.0 
7.0 
7.0 
6.2 
6.4 
5.4 
6.2 
5.2 
6.0 
5.2 
5.6 
0.1 
7.2 
7.2 
7.2 
7.2 
7.2 
7.4 
7.4 
7.6 
7.8 
8.0 
0.3 
7.2 
7.2 
7.2 
7.2 
7.2 
7.2 
7.6 
7.6 
8.0 
8.0 
0.6 
7.2 
7.2 
7.2 
7.4 
7.2 
7.4 
7.6 
7.6 
8.0 
8.0 
1.0 
7.2 
7.2 
7.2 
7.2 
7.2 
7.2 
7.6 
7.6 
8.0 
8.0 
2.0 
7.2 
7.2 
7.2 
7.2 
7.4. 
7.4 
7.6 
7.6 
7.8 
8.0 
Bacterium campestre 
