9 
20] 
KARRER AND WEBB—TITRATION CURVES OF CULTURE MEDIA 303 
TITRATION DATA FOR VARIOUS LIQUID MEDIA 
Hydrogen ion concentration, PH 
. N/5 | N/5 | Dist i 
Solution Total 
No. | (4) | HCl | KOH | H:O | (eo) | Beet | Rich- | Pep- | Pfef- 
(ce.) | (ec.) | (ce.) decoc- cdi oie fer 
tion 
1 30 20.00 00.00| 50 I 1.2 1.4 1.4 
2 30 15.00 05.00| 50 1.2 1.3 2.0 1.5 
3 30 10.00 10.00| 50 1.6 1.4 3.0 1.5 
4 30 9.50 10.501 50 1.4 1.6 
5 30 9.00 11.00) 50 3.7 1.5 1.2 LI 
6 30 8.50 11.50) 50 1.5 1.7 
7 30 8.00 12.001 50 1.9 1.5 3.4 1.8 
8 30 7.50 12.501 50 1.6 1.8 
9 30 7.00 13.001 50 2.1 1.6 3.6 1.9 
10 30 6.50 13.50} 50 1.6 1.9 
11 30 6.00 14.00, 50 2.3 1.4 3.3 1.9 
12 30 5.50 14.50} 50 1.1 2.0 
13 30 5.00 15.001 50 2.6 1.4 4.0 21 
14 30 4.50 15.50) 50 1.8 21 
15 30 4.00 16.00) 50 3.1 1.8 4.2 2.1 
16 30 3.50 16.50) 50 2.0 2.3 
17 30 3.00 17.00| 50 UP 2.0 4.4 2.3 
18 30 2.50 17.50} 50 9.6 2.3 
19 30 2.00 18.001 50 3.8 2.2 4.9 2.4 
20 30 1.50 18.50] 50 7 
21 30 1.00 19.001 50 4.4 2.4 5.4 2.8 
22 30 .15 19.25| 50 4.5 
23 30 .50 19.50| 50 4.8 2.8 6.4 3.2 
24 30 .25 19.75| 50 5.0 
25 30 0.00 20.00} 50 5.2 4.6 7.0 4.3 
26 30 .25| 19.75| 50 5.4 
27 30 .50| 19.50| 50 5.6 7.4 5.3 
28 30 .45| 19.25) 50 6.4 
29 30 1.00| 19.00} 50 7.0 4.0 T. 0 5.6 
30 30 1.50| 18.50| 50 7.5 6.2 
31 30 2.00| 18.00| 50 8.8 7 Oy 23 6.3 
32 30 2.50) 17.50). 50 19 6.4 
33 30 3.00| 17.00| 50 9.8 8.1 8.8 6.6 
34 30 3.50| 16.50} 50 8.2 6.6 
35 30 4.00| 16.00} 50 10.0+| 8.2 9.2 6.8 
36 30 4.50| 15.50} 50 8.3 6.9 
37 30 5.00| 15.00} 50 8.3 9.6 7.0 
38 30 5.50} 14.50| 50 8.4 T. 
39 30 6.00} 14.00| 50 8.5 | 10.0 7.2 
40 30 6.50| 13.50) 50 8.6 7.3 
41 30 7.00; 13.00} 50 8.6 10.0 7.4 
42 30 7.650) 12.50; 50 8.7 7.6 
43 30 8.00| 12.00, 50 8.7 10.04+| 7.8 
44 30 8.50| 11.50} 50 8.7 8.0 
45 30 9.00| 11.00, 50 8.7 10.04+| 8.2 
46 30 9.50| 10.50, 50 8.7 8.3 
47 30 10.00| 10.00| 50 8.8 10.0+| 8.4 
48 30 15.00) 5.00, 50 8.9 9.0 
49 30 20.001 0.00| 50 9.1 9.6 
