294 



LECTURES ON IMMUNITY 



ACTION OF SERUM FROM A RABBIT, IMMUNISED WITH SHEEP-SERUM, ON 

 GOAT-SERUM (A) 



perhaps this difficulty depends upon a different solubility 

 of the precipitate in rabbit-serum and in i per cent solu- 

 tion of sodium chloride. Perhaps even a difference of tem- 

 perature in the two parts of the series is responsible for 

 the disagreement; it is really the weak point of these 

 measurements that the temperature cannot be controlled 

 during the centrifugation. But in any case there can be 

 no doubt that the chief part of the phenomenon is repre- 

 sented by the last formula. 



