PLATE 18 



Cross between the English bulldog and German shepherd for genetic proof of the absence 

 of achondroplasia in the long bones of the extremities of the bulldog, as contrasted with 

 cross between the bulldog and the achondroplasic bassethound. 



1 English bulldog 903 <?. 4 F, English bulldog-shepherd 658 $. 



2 German shepherd 111$. 5 F, bulldog-bassethound 694 <^. 



3 Bassethound 220 . 6 F, bulldog-bassethound 602 $. 



As indicated in figure 4, the F, bulldog-shepherd shows no symptoms of achondroplasia, 

 while the F, bulldog-bassethound hybrids in figures 5 and 6 show clearly marked expressions 

 of this distortion due to the gene for achondroplasia inherited from the bassethound parent. 



93 



