120 CHARLES E. STOCKARD 



bull bone type. This was shown by comparisons with the F, 

 bassethouncl-shepherd. 



The next two leg- skeletons, the fifth and sixth, are from 

 litter sisters, 1581 9 and 1583 9 . Both these show fully de- 

 veloped achondroplasia and are also judged to be ss in geno- 

 type. In bone type these legs are much like the F 2 hound 

 bone bassethound-shepherd hybrids. The fifth specimen, 

 1581 9 , shows some bulldog quality of bone, but 1583 9 is 

 quite typically double short on hound typed bone and, as 

 the photograph shows, this skeleton is unusually small and 

 dwarf for the breeds concerned. The scapula is very wide in 

 both, and the humerus is short, typically bent and twisted 

 on its axis as in fully developed achondroplasia. The fore- 

 arm bones are characteristic of the defect ; the deficiency of 

 the ulna is complete and the foot is everted and widely ab- 

 ducted laterally from the leg axis. These two pure or double 

 short 5.9 legs with largely hound typed bone are only slightly 

 if any more deformed than the mixed short si leg of the F] 

 on the dominant bull bone type. 



The high accentuation of the reaction in the bulldog typed 

 bone to the gene for achondroplasia is illustrated most strik- 

 ingly in the contrast between the two leg skeletons in plate '28. 

 The leg skeleton on the left is from the pure double short ss 

 F._> bassethound-Saluki 1211 ^ , which is photographed from 

 life in plate 12 (right in fig. 1) (p. 77). This dog was one of 



PLATE 27 



EXPLANATION OF FIGURES 



Right front leg skeletons showing inheritance of leg length and bone type in 

 English bulldog bassethound hybrids. 



L to R F,, VM2 J, 11. (This animal was definitely oversized and rather St. 

 Bernard-like in living appearance as well as skeletal type.) 

 F 2 1488 2, 11, hound bone. 

 F, 1311c?, 11, bulldog bone. 

 F, 1313 c?, si, bulldog bone. 



F 2 1581 2, ss, hound bone with some bulldog bone quality. 

 F 2 1583 2, ss, hound bone (skeleton unusually dwarfed for the two 



breeds concerned). 

 F, 602 2, si (for comparison). 



