PROTECTION AGAINST HUNTING 



315 



almost exactly the same in the two series. As for the percentage of 

 partial tolerance, it follows, for obvious reasons, the reverse 

 direction of permanent tolerance. The precise figures and their 

 statistical significances are recorded in Table IV and illustrated in 

 Figs. 8 and 9. It seems impossible, therefore, to escape the 



100 



60 



^0 



20 



€9 



CONDITION OF THE GRAR : 



I 1 Pe.rma.nent tolerance. 



VllA it^cUttrmintcL -toktcLncc, 

 iVvV^ PecrbioLl bolercLncc 

 WM l\lorMa./ rejection 



17^4^3^ 



Zl 





1 



79 Aninnals injected at 

 birth with homobgous 

 cells and facilitating 

 serum. 



37 Animals injected at 

 birth with homologous 

 cells and normal 

 serum . 



Untreated 

 animals 



Fig. 8. Bar diagrams expressed in percentage of the grafted animals in 



each one of the three series (protected, unprotected and normal 



controls). The figures at the bottom of each bar represent the actual 



numbers of animals. 



conclusion that animals treated with facilitating serum yield a 

 better tolerance (both from the point of view of the number of 

 tolerant animals and from the standpoint of quality of the toler- 

 ance) than animals treated with normal serum. Another point 

 worth mentioning concerns the number of animals which died 

 in the two series (facilitated and non-facilitated) between the time 

 of grafting and 100 days after grafting: the number is 16 animals 



