290 CHAKLES R. STOCKAKD AND A. L. JOHNSON 



PLATE 54 



Cross between the English bulldog and German shepherd to determine the genetic relations 

 between the bulldog skull and the normal long shepherd skull. 



1 English bulldog 885 $. 3 F, 658 $. 5 Backcross shepherd 1231 ?. 



2 German shepherd 112 $. 4 Backcross shepherd 1228 <$. b' Backcross shepherd 1227 <$. 



