258 



CHARLES E. STOCKARD AND A. L. JOHNSON 



hund. All other arrangements are the same as in text-figure 

 59. The curve for the Boston terrier backcross follows the 

 curve of the pure Boston terrier, and in most features ap- 

 proaches it very closely. The backcross dachshund curve lies 

 even closer to that of the pure dachshund. 



DACHSHUND 

 BOSTON TERRIER 

 BX DACHSHUND 

 BX BOSTON TERRIER 



Text-figure 60. Dachshund-Boston terrier cross. Comparison of skull measure- 

 ments and indices of the pure breeds and their backcross hybrids. 



