26 Electrometric Titration of Blood 
it would be necessary to remove more of the CO, than is accom- 
plished by Cullen’s method in order to show an angle or an asymp- 
tote. This removal of CO, is rapid at first but becomes slower 
and slower. 
In the following table the number of minutes between dropping 
in the acid and measuring the pH is recorded. 
Min. pH Burette reading. Min. pH \ Paes 
8.30 00 0.3 
00 OZ 1 7.20 
1 6.70 10 C230 
5 7.00 15 C30 
0 ed 00 0.4 
15 7.36 1 6.00 
20 7.50 5) 6.05 
Zo (300 10 6.07 
30 7.93 15 6.07 
40 8.02 
The above table merely shows that 40 minutes is not enough 
for the elimination of the CO, when an appreciable amount of the 
alkali is left in the plasma. The following table shows a similar 
experiment. " 
Min. pH Burette reading. Min. pH = sina 
8.04 10 7.30 
00 0.10 15 7.31 é 
1 7.30 00 0.31 
2 7.65 1 6.65 
4 7.80 5 - 6.73 
5) £289 10 6.73 : 
10 7 290es 00 0.35 
15 1292 1 6.15 
20 7.93 10 6.15 
30 7.94 00 0.40 
00 0.20 1 5.45 
1 7.00 5) 550) 
2 7.45 00 0.50 
10 €.55 1 4.75 
20 7.56 13 4.75 
00 0.25 00 0.60 
1 (Faw 1 4.40 
