286 



IMMUNO-CATALYSIS 



Immune guinea pigs' serum against tKe blood clotting enzyme was 

 prepared by three injections of 5 ml. of fresh rabbit serum at about 

 8-day intervals. The other guinea pigs received rabbit plasma which 



Table XV 



Inhibition of Plasma Clotting Enzyme of Rahhit Serum hy Anti-Rahhit 

 Guinea Pig Serum 



Series A 



Results 



(a) 0.1 ml. of unheated rabbit serum 

 -j-0.3 ml. of avian plasma 



(b) 0.1 ml. of unheated normal guinea pig serum 

 -|-0.3 ml. of avian plasma 



(c) 0. 1 ml. of unheated immune guinea pig serum 

 -f-0.3 ml. of avian plasma 



Clotting of avian plasma 

 within 15 to 30 min- 



utes 



Clotting of avian plasma 

 within 15 to 30 min- 



utes 



Clotting of avian plasma 

 within 15 to 30 min- 



utes 



Series B 



(a) 0.6 ml. of heated rabbit serum 

 -[-0.3 ml. of avian plasma 



(b) 0.6 ml. of normal heated guinea pig serum 

 -|- 0.3 ml. of avian plasma 



(c) 0.6 ml. of heated immune guinea pig serum 

 -}-0.3 ml. of avian plasma 



Avian plasma indefi- 

 nitely liquid 



Avian plasma indefi- 

 nitely liquid 



Avian plasma indefi- 

 nitely liquid 



Series C 



(a) 0.1 ml. of unheated rabbit serum 



-}-0.6 ml. of heated normal guinea pig serum 

 -[-0.3 ml. of avian plasma 



(b) 0.1 ml. of unheated normal guinea pig serum 

 -[-0.6 ml. of heated normal guinea pig serum 

 -\-03 ml. of avian plasma 



(c) 0. 1 ml. of unheated immune guinea pig serum 

 -[-0.6 ml. of heated normal guinea pig serum 

 -[-0.3 ml. of avian plasma 



Clotting a few minutes 

 slower than in Series 



A 



Clotting a few minutes 

 slower than in Series 



A 



Clotting a few minutes 

 slower than in Series 

 A 



