56 



Chapter V 



100 % to 35 % in 15 minutes, while when it contained M/130 HC1 

 and M/120 lactic acid the same reduction was effected in about 6 '5 

 and 7 '5 minutes respectively. 



,0 1 2Q 40 60 



100 



80 



60 



40 



20 



100 



80 



60 



40 



20 



Normui Blood 



" u ? 



0-2% ( 



FIG. 27. 



N 

 M 



E 

 HCL 



lood 



10 



20 

 FIG. 28. 



40 



60 



FIGS. 27 and 28. Katio of reduction of blood with a uniform stream of oxygen free gas. 

 Percentage saturation vertically. Time in mins. horizontal. Fig. 27. Comparison 

 on normal blood, with blood containing lactic acid and with blood reduced by carbonic 

 acid instead of nitrogen. Fig. 28. Shows the approximate equality of M/130 HC1 

 and M/120 lactic acid in their effects. 



Having made it clear that the sense in which I use the word 

 " reaction " is the strict one, namely the hydrogen ion concentration, 

 I will leave this point and pass to the consideration of the effective 

 concentration of oxygen. 



