32 G. LEJEUNE-LEDANT 



On the other hand, all the extracts prepared according to the 

 methods of preparation of the blood group substances, which, 

 instead of producing a transplantation immunity, give a pro- 

 longed survival of the homografts of the same donor, all these 

 extracts may be able to inhibit the haemagglutination reaction. 

 However, both these phenomena show a total lack of specificity. 



Table III 

 Haemagglutination inhibition test with epidermal cell-free extracts 



CBA red cells 



Serum Control i/i 1/40 i/ioo 1/200 i/iooo 



I. SAanti-CBA — — + + + + + + + + + + + + + + + 



11. SAanti-CBA 



+ 2mg. epidermal 



extract CBA* _ _ _ _ _ _ — 



III. SAanti-CBA 



+ 2 mg. epidermal 



extract SA* — — + + + + + + + + + + + + + + + 



* In wet weight and prepared by technique of Lejeune-Ledant and Albert (i960). 



Table IV 

 Haemagglutination inhibition test with splenic cell-free extracts 



CBA red cells 



Serum Control i/i 1/40 i/ioo 1/200 i/iooo 



I. SAanti-CBA — — + + + + + + + + + + + + + + + 



II. SAanti-CBA 



+ 2 mg. splenic 



extracts CBA 



(BBM)* _ _ _ _ _ _ _ 



+ 2 mg. splenic 



extracts CBA 



(OC)t - - - - 



III. SAanti-CBA 



+ 2 mg. splenic 



extracts SA 



(BBM)* — — + + + + + + + + + + + + + + + 



+ 2 mg. splenic 



extracts SA (OC)t — — + + + + + + + + + + + + + + + 



* In wet weight and prepared by technique of Billingham, Brent and Medawar (1958) 

 (BBM). 



t In wet weight and prepared by technique of Oth and Castermans (1959) (OC). 



