GENETIC TYPE AND THE ENDOCRINES 



257 



feature in the first and second generation hybrids are near 

 together and that the curves for these indices follow more 

 closely the curve of the dachshund parent than the Boston 

 terrier. 



DACHSHUND 



BOSTON TERRIER 



F, - 



Text-figure 59. Dachshund-Boston terrier cross. Comparison of skull measure- 

 ments and indices of the pure breeds and their first and second generation hybrids. 



In text-figure 60 the dotted line represents the average 

 record for the backcross of the F l with the Boston terrier, 

 and the dashed line the backcross of the Fj with the dachs- 



