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 F x s which 

 were trained range from 65 to 88. 



int. 308 <$ — 65 

 int. 1776 c?— 77 

 int. 246J—77 

 int. 251 c? — 88 

 int. 1780? — 88 



Although 1776 S and 1780 2 are litter mates, as are 246 $ 

 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 i 

 and 1780 9. The shepherd sire of 308 S 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 FjS 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 



