292 



LECTURES ON IMMUNITY 



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

 SHEEP-SERUM ^ 



periments were also diluted in the same manner. The 

 experiments were calculated in the following manner, i 

 c.c. of the sheep-serum is equivalent to 40 units of precipi- 

 tate. The number of such equivalents of sheep-serum is 

 given in the second column. In the same manner 0.4 c.c. 

 of rabbit-serum contains 120 such equivalents, i.e. i c.c. 

 contains 300 equivalents. If now the volume is V, con- 

 taining originally A equivalents of sheep-serum and 120 

 equivalents of rabbit-serum, and P equivalents of precipi- 

 tate have been formed, then the concentrations of the two 



