628 W. T. JAMES 



Dachshund-Boston terrier hybrids. The hybrids obtained 

 by crossing- the dachshund with the Boston terrier show the 

 same general variations in bodily form as found in the 

 bassethound-English bulldog hybrids. The dachshund-Boston 

 terrier F x s are uniform in size and resemble each other 

 closely. In cranial shape they more nearly approach the 

 Boston terrier, but they have the shortened extremities, the 

 long straight tail, and the flopping ears of the dachshund. 

 Two of these dogs, 127 S and 128 9 , with chest indices of 

 79 and 80, respectively, and thus of the round bodied group, 

 were trained in the salivary situation. Here they followed 

 the same course of performance as the two dachshund types 

 discussed above, placing them in the A classification. Animal 

 127 $ formed a conditioned response after sixteen signals had 

 been applied ; 128 9 formed the response after twelve signals. 

 The conditioned response was weak in both cases. In the 

 case of 128 9 , by the time eighty-five signals had been applied 

 the conditioned response had disappeared, after which the 

 animal made no response at all or responded only to food. 

 No. 127 $ behaved in the same manner, becoming completely 

 inhibited after 100 signals. 



The F 2 s of this cross show a curious combination of the 

 grandparental characters. The short legged condition again 

 appears as a single factor dominant in conformity with the 

 record for this character in the bassethound-shepherd F 2 s. 

 The Boston terrier head and tail are multiple factor expres- 

 sions, entirely independent of the leg condition. There are 

 dachshund-legged dogs with the Boston terrier head and 

 long, bent or short screw tails. There are tall, long legged 

 dogs with dachshund head and tail. The head is not alto- 

 gether recessive; its full expression involves both dominant 

 and recessive factors since all the F 2 s show some resemblance 

 for this feature to the Boston terrier. 



None of the F 2 dachshund-Boston terriers was studied in 

 the behavior experiments. On the basis of their general 

 behavior in the kennel, and in comparison to the bassethound- 



