130 CHARLES R. STOCKARD 



skeleton (fig. 9), and two aspects of a recessive long leg 

 skeleton (figs. 10 and 11). The leg conditions as shown by 

 these skeletons compare very closely with those for the 

 bassethound-shepherd cross, illustrated in plate 3 (p. 55), 

 and the bassethound-bulldog cross shown in plates 20 and 

 21 (pp. 99 and 100). 



The F! dachshund-Boston terrier hybrid has been back- 

 crossed with both parent stocks with a resulting distri- 

 bution of leg lengths exactly as would be expected on the 

 basis of our knowledge of the bassethound-shepherd cross. 

 Plate 44 (p. 247) shows the backcross of the F x on the Boston 

 terrier parent with the two possibilities for leg length, pure 

 long II and intermediate short si. The backcross in the op- 

 posite direction, with the dachshund stock, is illustrated in 

 plate 45 (p. 248). Here the recessive long leg is completely 

 absent since all specimens must carry the gene for short. 

 We find the two types of short leg, the very short ss and the 

 incomplete short si, in about equal numbers. 



Leg skeletons of the dachshund-Boston terrier hybrids. 

 Skeletons of the right forelimbs from three different F 2 

 dachshund-Boston terrier litter groups are illustrated in de- 

 tail in plate 32. Figure 1 shows two recessive long legs and 

 an intermediate short si. The first long bone skeleton shows 

 much heavier and more nearly hound typed bone than does 



PLATE 31 



EXPLANATION OF FIGURES 



Skeletons of the dachshund-Boston terrier cross showing contrast in leg length, 

 skull formation, tail, etc., in the pure breeds and the resulting conditions in the 

 first and second generation hybrids. 



1-2 Dachshund 84$. 6-11 F 2 hybrids. 



3 Boston terrier 106$. 6-7 1697^ (puppy). 



4-5 F, 130$. 8 779^ (midget). 



9 782 <$. 

 10-11 352 <?. 



