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W. T. JAMES 



appearing altogether. As this decrease in intensity of the 

 salivary response occurs, the reaction becomes longer de- 

 layed. A typical kymographic record of the reaction of this 

 dog is shown in text-figures 91 (figs. 1 and 2), and 92 (fig. 1). 



Text-figure 92. Graphic records of types A and B, including head movement 

 (as indicated by second line from top) during the positive and negative signals. 

 The movements of type A are deliberate and directed; those of type B are 

 variable, alternating toward and away from the pan as the signal continues. 



