GENETIC TYPE AND THE ENDOCRINES 



543 



of animals 83 9 and 219 $ , both bassethounds, will indicate 

 the common tendencies among the members of the group 

 (text-figs. 89 and 90). The black lines show the value of the 

 conditioned salivary reaction to the 30 second test signal for 

 each experimental period. The negative signals are indicated 

 by markings below the zero line. The blank spaces on the 

 chart, which are not marked below the zero line, indicate 

 that there was no salivary reaction to the positive signal. 



Text-figure 



Only the reactions to the positive test signal and the negative 

 are presented here. The lower chart indicates the delay, or 

 the time between the presentation of the signal and the be- 

 ginning of the flow of saliva. As we have pointed out above, 

 four or five stimuli of short duration were given each day, 

 but since they were not continued long enough before rein- 

 forcement for a conditioned reaction to occur, they are not 

 included in the charts. At the lower left corner of each chart 

 the number of signals given before the development of a 

 conditioned reaction is shown. At the rig-ht of each chart 



