GENETIC TYPE AND THE ENDOCRINES 553 



fered to any change that may be introduced. No apparent 

 effort is needed for their adjustment to the laboratory and 

 apparatus and they are content to remain in the room. Fol- 

 lowing this, the stimuli or signals cause no disturbance, and 

 the dogs appear almost insensitive when the clicker is first 

 applied. Since this signal accompanies food, the food taking 

 reaction is elicited after a few applications, at which time 

 there is a direct orientation movement to the pan as soon 

 as the signal begins. There is a long delay between the 

 beginning of the signal and the flow of saliva. After repeated 

 presentation of the signal with food, the dog disregards the 

 stimulus and waits rather for the rotation of the disk and 

 the appearance of food. Postural movements are also elicited 

 by the rotation of the food table. In reality this is a selection 

 and elimination of patterns of action, and the process may 

 occur gradually, as in the case of animal 83 $ , or abruptly, 

 as in the case of 1426 $ . The response is not a widely gen- 

 eralized one, as emphasized by the failure to develop a re- 

 action to other signals. After the dogs have reached what 

 is termed the logical end of the adjustment, it is almost 

 impossible to motivate them to further action in the laboratory 

 environment. At this time they appear completely insensitive 

 and show a tendency to remain inactive and unresponsive 

 to variations in the laboratory. 



CHARACTERISTICS OF THE ACTIVE MODE OF PERFORMANCE, 



GROUP B 



Five dogs fall into this group, including the following : two 

 bassethound-Saluki F 2 s, 13829 and 13839, (these dogs were 

 definitely of the Saluki type, showing no characteristics of 

 the bassethound) ; two German shepherds, 1285 9 and 438 9 ; 

 one bassethound-German shepherd F 2 709 $ (with the physical 

 form of the German shepherd). 



In contrast to group A, the dogs of this group are slow 

 to make friends with strangers. They have a tendency to 

 become hysterical and must be approached with caution. Only 



