viii AGGLUTINATION OF B. PESTIS 223 



The results of the testing of this rabbit's blood serum 

 on emulsion of B. pestis (dilution 1 : 20) were the follow- 

 ing :— 



This experiment in its early stages contrasts markedly 

 with similar stages of experiment 5 ; for it shows that the 

 subcutaneous injection of Haffkine's prophylactic, even 

 after repeated (three) administration of considerable 

 amounts (10 cc. each time), did not succeed in producing 

 agglutinin in the animal's blood. 



8. Rabbits Nos. 5 and 6. — In this experiment the 

 administration of Haffkine's prophylactic was effected in 

 two rabbits by intravenous followed by subcutaneous 

 injection. As regards rabbit No. 5 : — 



[Table 



