1920 
TABLE V 
] 
CHAMBERS— BACTERIAL INHIBITION BY METABOLIC PRODUCTS 
207 
GROWTH 2 HYDROGEN ION CONCENTRATION OF BACILLUS COLI AT 
DEXTROSE BOUILLON, 
NEUTRALIZED AT INTERVALS 
° C., PLAIN 
AND 1 PER 
CENT 
2 
Plain bouillon 1% Dextrose bouillon 
Hours ' Cc. of 
Bacteria c. of Bacteria N/1 NaOH 
per cc. N/5 HCl Pu per cc. jand N/5 HCl] Pa 
added added 
N/1 NaOH 
0 57,000 T1 4,000 7.4 
12 184,000,000 7.0 | 259,000,000 5.3 
14 4.0 6.5 
24 391,000,000 7.3 | 347,000,000 5.1 
26 3 6.9 6.3 7,1 
36 552,000,000 7.4 | 507,000,000 5.1 
38 5 $1.0 6.5 6.9 
48 660,000,000 7.3 | 612,000,000 5.1 
50 5 6.7 7.0 7.0 
60 7.1 5.8 
62 3 6.7 7.0 6.7 
72 631,000,000 7.1 | 692,000,000 5.7 
74 3 6.7 7.0 7.3 
96 684,000,000 7.2 | 728,000,000 7.5 
N/5 HC] 
98 3 6.8 3.0 7.3 
120 696,000,000 7.3 | 532,000,000 7.3 
122 3 6.7 3.0 7.3 
144 680,000,000 7.3 | 455,000,000 7.5 
146 3 6.9 16.0 6.9 
168 570,000,000 7.2 | 487,000,000 7.5 
192 693,000,000 rom 618,000,000 1.0 
234 437,000,000 7.3 | 885,000,000 7.5 
236 3 6.9 15.0 7.0 
276 450,000,000 7.1 | 794,000,000 7.6 
278 4 6.8 20.0 v 
348 327,000,000 zn 608,000,000 7.7 
350 3 6.5 25.0 6.7 
492 256,000,000 7.1 | 441,000,000 8.1 
drogen ion concentration was determined before and after each 
addition. The plain bouillon was treated similarly, correcting 
the alkali with N/5 HCl. The growth in bacteria per cc., the 
hydrogen ion concentration and the cc. of acid or alkali added 
