THE PRECIPITIN REACTION. 



93 



300 



J00,{ 115 6 



1.1 t.7 



07 



1 



loo'/, ji. t 



Antigen 



FIG. 3. Comparison of two anti-pig sera of nearly the same strength, one from a 



rabbit, the other from a fowl. 



nearly the same homologous titer. The results are plainly 

 shown in graphical form in Figs. 2 and 3. Considering that the 

 range of error in reading the ring test was 50-100 per cent, there 



TABLE VIII. 



REACTIONS OF ANTIPIG SERA. 



