fl->^ 



Quantitative Predpitin Tests 



No trace of reaction was obtained with corresponding dilutions of 

 the bloods of Man, Cat, Hyaena, Dog, Seal, and Wallaby. Further 

 investigations will be required with antisei-a for Insectivora. 



3. Quantitative Tests with Anti- Carnivore Sera. 



Tests luitJi Anti-Gat Serinu (1, vi. '02). 

 Antiserum from rabbit treated with the serum of Felis doinesticus. 



The antiserum used in this case was weak. The only bloods which 

 gave measurable quantities of precipitum were those from Carnivora. 

 The blood of Felis caracal (800) gave no precipitum, this being probably 

 due to an excess of chloroform having been added to it, causing some 

 precipitation ; it however reacted with a distinct cloudiness upon the 

 addition of antiserum. The bloods of the Jackal, Raccoon and Genetta 

 gave no reaction. The high figures given by the bloods of Lutra* 

 and Ursus* are attributable to these bloods being somewhat concen- 

 trated through keeping, as noted elsewhere. Owing to the very 

 small amount of precipitum with the bloods of Ursus, Canis, and 

 Felis tigris, these measurements cannot be considered accurate. Of 

 11 bloods of Carnivora examined with this weak antiserum, seven 

 gave a precipitum, one a clouding only, and three a negative result. 

 Twenty-eight other mammalian bloods were tested at the same time 

 with uniformly negative results, the bloods examined being fi-om 

 Primates (7), Ungulates (12), Cetacea (1), Marsui)ialia (8). 



