Anti-Hyaena Serum, 



175 



powerful to include the Pinnipedia. On referring to the percentages 

 of reactions all told, occurring between anti-cat serum and the bloods 

 of Felidae and Hyaenidae, we find that even the weak anti-cat serum 

 proved the close relationship of these two families, in a manner corre- 

 sponding to what we have found with anti-hyaena serum. Moreover, 

 in the case of both antisera, the lowest percentages of reactions all told 

 are given by the bloods of Viverridae, Canidae, Ursidae and Mustelidae. 



* Rodent blood 257 (see text). 



Of the 11 bloods of Carnivora giving negative results in the pre- 

 ceding table, there were two of Viverridae (168 from Borneo, 169 dried 

 18 months), four of Canidae (187, 189, 196, 204, the three first from 

 India, the last from Paraguay), one of Ursidae (206 dried 17 months). 

 These bloods have evidently been the cause of lowering the percentage 

 of positive results with anti-hyaena serum, but they do not account 

 entirely for the lower percentages obtained with these families. On 

 the other hand, the four bloods of Mustelidae giving a negative 

 reaction, had all been collected in England, and presumably had not 

 been subjected to any conditions which would alter the bloods so that 

 they would not give good reactions with a suitable antiserum. 



One of the two rodent bloods(*) giving a medium clouding was No. 257 



