TABLES. 



49 



Table 44. — F 3 generation produced by extracted hooded rats (F 2 generation) derived from a 

 cross of a hooded rat of the minus series with a wild rat. (See Table J+2.) 



Table 45. — F4 generation from minus series crossed with xvild. 



Table 46. — Fi, generation from minus series crossed xrith wild. 



