LECTURES ON IMMUNITY 



are given four values corresponding to the times, 20, 40, 

 100, and 180 minutes respectively ; they are 27,300, 24,400, 

 19,300, and 15,800 respectively. They seem to indicate 

 that the limit-value lies a little above 27,300, but the calcu- 

 lation would give a better agreement if, in the first in- 

 stance, /*> were fixed at 25,000, which value therefore per- 

 haps comes near to the end-value. The only statement 

 that can be made is that these values are of nearly the same 

 magnitude as those for the haemolytic action of (weak) 

 acids and bases, and that a closer investigation might 

 bring them into agreement; this would have a physical 

 meaning, namely, that it is probably a change in the con- 

 dition of the erythrocytes that causes the increase of the 

 reactivity with temperature. 



Two other haemolytic substances have been investigated 

 by the same authors, namely, the oleate of sodium and 

 triolein. They gave, with the same suspension of erythro- 

 cytes as was used in the other experiments, namely i per 

 cent of red cells from the horse, the following results : 

 HAEMOLYSIS BY MEANS OF 



With regard to the magnitude of /*, the oleate and the 



