50 CHARLES R. STOCKARD 



for its inheritance. The further proof of this fact will be 

 shown below. 



The reciprocal cross was now made, with two bassethoimd 

 bitches mated to three different German shepherd males. The 

 pure-line bassethoimd "Paula" 277? was mated to a cham- 

 pion shepherd male and whelped five puppies, two males and 

 three females. All five hybrids showed short achondroplasia 

 legs. 



The second bitch, "Staridge Jill" 83 9 , was a perfect basset- 

 hound in type, yet she again carried the long leg factor from 

 the foxhound ancestor, as did the dog "Leader" cited above. 

 "Jill" was mated to a pure shepherd dog and whelped a 

 litter of eight puppies, four males and four females. Five 

 of these were short legged and three were long. "Staridge 

 Jill" was later mated to a different shepherd, 1132 3, and 

 whelped seven puppies, four males and three females ; only 

 one of these was long legged, while six were short. 



The achondroplasia short leg of the bassethoimd definitely 

 dominates the normal long leg in these crosses with the 

 shepherd dog. When pure stock is employed, all members 

 of the first, F lf hybrid generation have short legs. The legs 

 of the heterozygous F, group are not so extremely achon- 

 droplasia nor so fully short as those of the pure homozygous 

 bassethound. The F, hybrids all carry, of course, the factor 

 for long from the shepherd parent, and the achondroplasic 

 short condition is not so fully expressed when the allelomorph 



PLATE 2 



EXPLANATION OF FIGURES 



Cross between the long legged German shepherd and the achondroplasic short 

 legged bassethound showing inheritance of leg length as well as other physical 

 characters in the first and second hybrid generations. 



1 German shepherd 118 $. 



2 Bassethound 220 <?. 



3-4 F, brother and sister 246 $ and 248 <?. 



5-11 One litter of seven F = hybrids. 



5 866 c?. 9 868 c?. 



6 865 <?. 10 863 c?. 



7 864 c?. 1 1 862 £. 



8 869 ?. 



