GENETIC TYPE AND THE ENDOCRINES 



725 



This dog was a remarkably quiet animal, exhibiting certain 

 signs of shyness. His disposition seemed, curiously enough, 

 1 tartly shy and partly phlegmatic. He seemed afraid of other 

 dogs and of people yet lay around dozing at intervals through- 

 out the day. The training period was 9 months, during which 

 time only a weak motor C-R, formed in five trials, could be 

 established. Adrenalin, 1 cc. of 1 :25,000 solution, was given 

 intravenously on 3 successive days, and the C-E was defi- 

 nitely affected in the period after each injection. The efficiency 

 of the response was diminished somewhat on all 3 days, while 

 its magnitude during the same period showed an increase 

 followed by a marked progressive decrease. The dog was 

 observably restless on the second day. 



TABLE 25 

 Bog 742 J 



TRAINING 

 PERIOD 



AFTKli ADRENALIN 



1st day 



Correct responses to positive Met. 120 94% 80% 



Average magnitude of C-R to positive 



Met. 120 16 18 



2nd day 



80% 

 13 



3rd day 



83% 

 4 



It can be seen from table 25 that the efficiency of the re- 

 action was lowered noticeably on the first day (94 per cent 

 to 80 per cent) and remained through the critical tests at 

 about the same level. The average magnitude showed a 

 slight increase on the first day (16 to 18), a decrease on the 

 second day (to 13) and a further notable decrease on the 

 third day (to 4). The experiment is presented in exact detail 

 in table 26. 



On the first day, a slight increase in the value of the C-R 

 was noticed immediately upon resuming the tests after the 

 injection (15 to 25 within 18 minutes). The value continued 

 to rise gradually, and the magnitude was maximal 39 minutes 

 after the injection. Thereafter it gradually decreased and 

 after 5 hours and 19 minutes was reduced to zero. 



On the second day the reflex did not increase appreciably 

 over the maximal reading just before the injection (24 to 

 25). The most striking result was the reduction of the value 



