THE PRECIPITINS AND THEIR ANTIBODIES 



295 



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

 ON BULLOCK-SERUM (A) 



This is to a still higher degree valid for the experiments 

 with bullock-serum, reproduced above. One c.c. of this 

 serum contained 40 equivalents, 0.4 c.c. of the rabbit-serum 

 only 35 equivalents. KWZLS found to be equal to 85. 



The agreement is very satisfying. 



The conclusions which may be drawn from these three 

 series are rather interesting. On injection of sheep- 

 serum into rabbit blood we have obtained an antiserum 

 containing per centimeter cube 300 equivalents of pre- 



