20 



Genetic Studies in Babbits 



of the F 

 materia 



6 



einish as is shewn graphically in Fig. 12. No doubt our origina 

 was heterogeneous with regard to the genetic factors tha 



Cf Nl69 



(5*02011 

 9O203' 



• $P« •(5^P,225 

 228 



Fig. 12. Graphic representation of weight distribution in Flemish animals. 

 (Cf. Table I, p. 21.) 



govern size, but even so the rapid diminution can hardly be accounted for 

 by mere sifting out of genetic factors. Our experience with the Polish, 

 though even more limited, agrees with that of the Flemish. Experi- 

 ments are now in progress to ascertain the effects of continued inbreeding 

 on weight both in these two breeds and in an extracted strain of small 

 size from the Flemish-mixed cross (cf. Table IV, p. 24). It is hoped 

 also in this way to obtain homogeneous material which, by a system of 

 reciprocal crosses, can be used to elucidate the mode of transmission of 

 size. 



The experiments of which an account is given above form part of a 

 series of investigations on heredity in rabbits for which the means have 

 been provided out of the Fund controlled by the Development 

 Commission, 



