GENETIC TYPE AND THE ENDOCRINES 621 



MIXED NATURE OF THE ENGLISH BULLDOG is EMPHASIZED IN THE 

 SECOND GENERATION BULLDOG-BASSETHOUND HYBRIDS 



English bulldog-bassethound Fzs. As is the case with the 

 bassethound-shepherd cross, there is wider variation in physi- 

 cal form among the bulldog-bassethound F 2 s than among the 

 F a s. These differences are even more striking in the bulldog- 

 bassethound cross, since there are modifications in nearly all 

 bodily factors. For example, there are variations in leg 

 length, tail, and in the degree of shortness of the skull. The 

 variation in the skulls is treated fully in Section III and 

 illustrated in plate 57 (p. 321). The heads in the F 2 s differ 

 in size, in the degree of undershot condition of the mandible 

 and in the amount of shortening of the face (pi. 58, p. 323). 

 There is also a difference in the degree of loose overgrowth 

 of the skin, and a wide range of size and bodily form among 

 the F2S. The growth abnormalities are associated with a 

 peculiar glandular condition and the constitutional complexes 

 arising from the new combinations of factors among these 

 hybrids. The mixed physical types in this group cause many 

 of the dogs to be particularly odd and comic in form. 



Among these F 2 s there is less variation in bodily shape 

 than in any other physical character. Most of the dogs in- 

 herit a round chest and full abdomen, although they are not 

 all as round chested as the bassethound. The short legged 

 dogs have the rounder chests, and the long legged dogs are 

 slightly thinner, although never as thin as the shepherd. 

 Plate 105 (figs. 5 and 6) shows two of these F 2 s. The chest 

 indices of the group are as follows: 



lg. 1308$ 69 int. 2026^ 83 



Ig. 1054^71 int. 980^ 83 



lg. 991^ 71 sh. 1309$ 86 



int. 1310^ 82 sh. 979^ 87 



Behavior of English bulldog-bassethound F. 2 s. All the dogs 

 of this generation with short and intermediate legs 979 $ , 

 1309$, 9805, 13105, 20265 --fall into the inactive or A 

 and A-plus groups in the food taking situation. Two of 



