728 0. D. ANDERSON 



The extent of the changes in efficiency and magnitude of 

 the C-R are shown in table 27. The increase in efficiency 

 was not large (86 per cent to 100 per cent). The slight 

 increase in the magnitude of the C-R during the first adrenalin 

 period is shown (9 to 12), followed by a further rise in the 

 second period when the stronger doses were given (to 19), 

 followed in turn by the enormous decrease in the last period 

 (to 3). 



TABLE 27 



Dog C-l $ 



TP , TV , T „« DURING DURING DURING 



ADRENALIN 



1: 50,000 



ADRENALIN ADRENALIN 



1: 25,000 1: 1,000 



Correct responses to positive Met. 120 

 Average magnitude of C-E to 

 positive Met. 120 



86% 100% 



100% 100% 



19 3 



Table 28 shows the entire protocol of the three injection 

 periods in dog C-l. In the first period, note the rise of the 

 reaction value during the first day (11 to 19) and its fall to 

 below the normal level on the third day (to 7). Note the 

 similar result in the next period, the increase on the first 

 day (12 to 28) followed by the decrease on the third day 

 (to 12). And in the last period note the amount of the 

 decrement from the minimal response in the preceding con- 

 trol period to the minimal response in the critical period 

 (16 to 1). 



The efficiency of the C-R showed an apparent small increase 

 when the three critical periods were compared with the 

 training period. 



It is of interest to note that several hours after a massive 

 dose of adrenalin, the motor C-R declined to zero, and that 

 simultaneously the amount of spontaneous activity in the 

 intervals between stimulations was greatly augmented. The 

 Lowered value of the salivary C-R occurring on the third 

 day of injection is strikingly similar to the result found in 

 the sheep by Liddell, Anderson, Kotyuka and Hartman ('35). 

 In this study, on both normal and neurotic sheep, the con- 

 ditioned motor reflex was lowered on the third dav after the 



