GENETIC TYPE AND THE ENDOCRINES 607 



When the members of one litter of F 2 s are compared with 

 each other, there is a wider range in bodily index than is 

 found among a litter of F a s. This can be demonstrated by 

 two sibs, 8674 and 8635. The F x parents of these dogs, 

 247 9 and 308 $ , had chest indices of 77 and 65, respectively, 

 a difference of 12. The indices of 8675 and 8635 are 74 

 and 90, a difference of 16, giving them a greater variation 

 than the parents and nearly as great as that between the 

 pure bassethound, which is about 90, and the pure shepherd, 

 which is 68. Animal 867 $ is shown in plate 103 (fig. 4), and 

 animal 8635 in the same plate (fig. 3). 



The variations among the F 2 s are further demonstrated 

 by a litter of ten bassethound-shepherd hybrids of this gen- 

 eration, which were not trained in the experiments but which 

 were offspring of two trained FjS, 1776 5 and 1780 9 . These 

 dogs are shown in plate 104. The chest indices of this litter 

 are as follows : 



int. 2592$ 60 Ig. 2586 $ 70 



Ig. 2591$ 62 int. 2590 $ 70 



sh. 2587 c? -63 int. 2588 $ 70 



Ig. 2593$ 65 sh. 2594$ 79 



int. 2585$ 68 sh. 2589^ 94 



It will be observed that most of these dogs are as thin bodied 

 as the shepherd, with indices below 70 and as low as 60; 

 others are as round bodied as the bassethound, with the high- 

 est index reaching 94. Three dogs are short legged, like 

 the bassethound grandparent; four are intermediate, like the 

 F!S; and three are long legged, like the shepherd grand- 

 parent. Two of the long legged animals, 2591 9 and 2593 2 , 

 have thin bodies, and thus are about the same in physical 

 form as the shepherd grandparent. In addition, a thin body 

 is found on one short legged dog, 2587 5 . This animal had 

 a more mixed physical form than the two long legged animals 

 with thin bodies. Such variations in bodily structure give 

 an odd appearance to many of these dogs. All dogs of this 

 litter have the long, flopping bassethound ears. 



