98 



ALAN ARTHUR BOYDEN*. 



X5GOO 



800 



PU3 



i.f 



it . 



/Z il. II <? 



FIG. 7. Reactions of two anti-dog sera from rabbits. 



Table XII. shows the reactions obtained with four different 

 antihorse sera, two from rabbits and two from fowls. The 

 blood for these injections \vas obtained from a single horse. 

 The rabbit sera are shown in Fig. 8. As may readily be seen 

 the poorest correspondence in the whole series of antisera was 

 obtained here. 



The data for all these reactions show that there may or may 

 not be correspondence in the reactions of various antisera of 

 the same kind. If this is true how may it ever become reasonably 

 certain ih.it .my series of values represents the true relationships 

 of the anim.tU ic-ied? Perhaps there are two criteria by which 

 ize the truth in these reactions. In the first 

 plai r \\li' cneral correspondence occurs in the reactions of 



ra of the same kind, produced in similar or 



n would seem probable I hat the reactions 



ty in the relationships of the animals 



iiM l.r especially true where an antiserum pro- 



