620 W. T. JAMES 



hound (pi. 103, fig. 2; pi. 105, fig. 3). The head shape is more 

 normal than the parent bulldog, although, as a rule, the lower 

 jaw is slightly undershot. The tail in these hybrids is long 

 and straight, as in the bassethound. 



Two dogs of this group, 740 $ and 697 ? , were trained. 

 The chest indices were 85 for 740 $ and 78 for 697 9 , placing 

 them both in the round bodied group. 



Behavior of English bulldog-bassethound F-iS. Both 740 $ 

 and 697 9 were classed with the intermediate group in be- 

 havior, although they were not alike. Each formed a good 

 conditioned salivary response, but the positive was much 

 more vigorous in 697 9 than in 740 $ , Both developed inhibi- 

 tion of the positive reaction after a relatively small number 

 of stimuli. The response disappeared in 740 $ after 133 

 stimuli ; and in 697 9 after 130 stimuli. After disappearance 

 of the salivary response, however, the reaction was elicited 

 by the rotating disk. They did not become completely passive 

 in the conditioned food taking situation, but did become 

 sluggish and unresponsive to the mild tactile stimuli, as was 

 shown for the dogs of group A. They differ from the basset- 

 hound in that a negative response is formed and they are 

 able to give the positive and negative reaction for a short 

 time before the positive becomes inhibited. Animal 697 9 

 had greater difficulty in forming a negative, and is there- 

 fore considered more excitable than 740 $ . No. 697 9 was 

 classified as B-minus while 740 $ was placed in the A-plus 

 group. 



In the motor reflex experiments, these dogs also conform 

 to the mid-group type. They formed excellent avoiding re- 

 actions with an excitation-inhibition ratio similar to the mid- 

 group dogs, as shown in the case of 697 9 and 740 $ of 

 text-figure 104. The hyper-excitable nature of the English 

 bulldog parent, as shown under similar conditions, was absent. 

 Breeding the abnormal physical type, the English bulldog, 

 to the homozygous bassethound of type A, results therefore 

 in rather well balanced offspring. 1 



