604 W. T. JAMES 



this reason should be similar in physical form, or have no 

 greater variation than is found among the members of one 

 breed. Thus, the bassethound-shepherd F x s are similar in 

 physical form, size, coat texture, and color, and all have 

 short legs, although not so extreme as those of the basset- 

 hound parent. Each member of the group has the long, droop- 

 ing ears of the bassethound. Although there is some variation 

 among them, this is no greater than would be found among 

 a large group of any pure breed (pi. 103, fig. 1). 



The bodily indices of the bassethound-shepherd FjS which 

 were trained range from 65 to 88. 



int. 308 <$ 65 

 int. 1776^ 77 

 int. 246 $ 77 

 int. 251^ 88 

 int. 1780$ 88 



Although 1776 $ and 1780 9 are litter mates, as are 246 9 

 and 251 $ , the difference in bodily index between both, pairs 

 of sibs is 11 points. This is not, however, as wide a difference 

 as is found between the bassethound and German shepherd 

 parents. For example, the bassethound parent of 1176 $ and 

 1180 9 had an index of 90 and the German shepherd parent 

 an index of 68, a difference of 22. This difference is much 

 greater than will be found among a group of F x s of one 

 litter. It is noted that animal 308 $ had a chest index of 

 65, or 3 points less than the pure shepherd parent of 1776 $ 

 and 17809. The shepherd sire of 3085 died before these 

 experiments were started and his bodily index could not, 

 therefore, be obtained. If the shepherd parent of 308 $ had 

 a lower index than the shepherd parent of 1776 $ and 1780 9 , 

 this Fj with a thinner body than a pure shepherd would not 

 be improbable. Since the F^ are not exactly alike it would 

 seem to indicate that the parents are not as pure genetically 

 as they are thought to be, or that unexplainable interor- 

 ganismal variations have occurred, due to mixing of genetic 

 factors, which affects the development of each animal. 



Behavior classification of F-^s. In the experiments on be- 

 havior, none of the animals was classified with the typical 



