606 W. T. JAMES 



bassethound or German shepherd parents. The reactions of 

 246 9 , 1776 $, 251 $ , and 1780 $ were similar, and 246 9 and 

 251 $ have been discussed fully in the sections on the food 

 taking reaction and the motor reaction. All four animals 

 were placed in the A-plus intermediate group, or the well 

 balanced type useful for general experimental purposes. The 

 fifth Fj studied, 308 $ , was more excitable than others of 

 this group, but still of the intermediate type; its rating is 

 B-minus. This dog had greater difficulty in forming the nega- 

 tive reactions than did others of his generation. Although 

 individual behavior differences are found among these F x 

 animals, these are no wider than found for the bassethound 

 and German shepherd parents. Another factor of importance 

 is that there is no great variation in behavior when these 

 dogs are studied in different situations. There is not only 

 homogeneity among the members of a group, but also a 

 rather harmonious blending of the behavioral determining 

 factors in each dog as well as those determining physical 

 form. 



Bassethound-shepherd F 2 s. When the short legged first 

 generation hybrids are mated inter se, the second generation 

 shows a clear cut redistribution of the contrasted grand- 

 parental characters. Both the short, bent legs of the hound 

 and the long straight thin legs of the shepherd reappear 

 in the second generation in the expected Mendelian ratio of 

 3 to 1. The shortness of the leg differs among the members 

 of the group; about one in three is as short as the basset- 

 hound while the other two resemble more closely the FiS. 

 The long legged animals of the F 2 generation are truly long, 

 like the shepherd. There is also some variation in bodily 

 form among these F2 dogs. However, with the group used 

 in these experiments, the variation is no wider than that 

 found in the F^. The chest indices of the group are as 



follows: 



]g 1811^ 68 Ig. 1153^ 75 



int. 1152^ 69 int. 1528^ 80 



int. 1812^ 69 Ig. 867^ 90 



sh. 863 <f 74 



