26 DAVID I. MACHT AND SHACHNE ISAACS 



The simple reaction time for light ranged from 0.112 to 0.220 

 of a second, the commonest figure lying between 0.120 and 0.160 

 of a second. 



The reaction time for the addition test ( + 17) varied from 

 1.154 to 3.010 seconds, the commonest figure being a little over 

 two seconds. 



The reaction time for the multiplication and addition tests 

 was much longer, the figures ranging from 2.456 to 6.810 sec- 

 onds, the commonest figures being between three and five 

 seconds. 



It will be seen that of the simple reactions, that for light 

 was the shortest and that for sound was the longest. 



EFFECT OF MOEPHIN 



It was found that the effects of a morphin injection depends 

 on the size of the dose and manifests itself in one or more of three 

 ways. In the first place, the absolute reading of the reaction 

 may be affected. In the second place, the mean variations in 

 the readings may be greatly increased or decreased. In the 

 third place, in the case of association reactions, there may be an 

 effect noted on the accuracy with which the subject performs 

 mental problems. 



After small doses of morphin (4 to 6 mgm.) there was noted a 

 distinct primary effect, which consisted in a stimulation or a 

 shortening of the reaction time, or in a decrease in the mean varia- 

 tion of the readings, or sometimes in both, and furthermore in a 

 lesser number of errors made in the computation of mathematical 

 problems. This primary effect of morphin generally lasted half 

 an hour or more and was followed by a secondary stage charac- 

 terized by a depression, as indicated by the prolongation of the 

 reaction time and greater variations in the readings or both. 

 After very small doses of morphin, however, the depression was 

 sometimes lacking. 



After larger doses of morphin (8 to 15 mgm.), however, the 

 primary stage of stimulation was very short and could be easily 

 overlooked unless the readings were begun very soon after 

 the injection of the drug. Depression, on the other hand, was 



