174 Tests with Precipitins 



785 Tests with Anti-Cat Serum. 



This antiserum was obtained by injecting a rabbit with the serum 

 of Felis domesticus. The antiserum was weak, giving a precipitum 

 of -005 c.c. 



It will be seen from the preceding table that this antiserum only 

 produced full reactions amongst the Felidae. Many of the bloods had 

 been dried for over a year when brought into solution and tested. 

 This, but especially the weakness of the antiserum, accounts for most 

 of the reactions being so slight. The two negative results obtained 

 with Felidae were with one blood of F. domesticus (No. 155) dried 

 19 months, and one of a leopard (147) sent to me by Mr E. H. Hankin 

 from Agra, India. The blood-relationship amongst the Carnivora is 

 however fairly well shown, excepting in the case of the Pinnipedia. 

 The other mammalia showed a much smaller number of faint reactions. 

 One rodent blood (marked *, No. 288) gave a medium reaction, this 

 was from an agouti and it behaved curiously with other antisera, as 

 will be seen by reference to its number in the tables. The agouti 

 blood, which had been preserved with chloroform, showed slight 

 reactions with anti-wallaby and anti-Mexican-deer and also gave a 

 medium reaction with anti-horse serum. I cannot as yet explain this 

 result, as this blood did not react to 16 other antisera. 



(2) 378 Tests with Anti-Hyaena Serum. 



This antiserum was obtained by treating a rabbit with the serum 

 of Hyaena striata, the animal having died at the Zoological Gardens, 

 London. This antiserum was much more powerful than the preceding. 

 It gave a precipitum measuring "031 c.c. when '1 c.c. of the antiserum 

 was added to '5c.c. of a 1 : 100 dilution of hyaena scrum. 



A glance over the following table immediately shows that a con- 

 siderable number of reactions took place with the bloods of mammalia 

 other than those belonging to the Carnivora. When we however confine 

 our attention to the largest reactions, we find that they occur solely 

 amongst the Hyaenidae and Felidae. If we include all the reactions, 

 faint and otherwise, as positive ones, we find on reading the percentages 

 opposite each family of Carnivora, that they are higher in each of these 

 families than in any other mammalia not belonging to the order 

 Carnivora. The percentage of reactions amongst the Carnivora, taken 

 as a whole, is also higher. The anti-hyaena serum is sufficiently 



