Pulse and Respiration. 



115 



The effect of alcohol upon the pulse rate of Subject VI is also indi- 

 cated in table 20 by the statistical method of differences. The average 

 differences given in the last column of the table show that on the normal 

 days the average difference is always a plus value. These average 

 differences for the seven experimental conditions are, for the normal 

 days, +11, +54, +78, +77, +25, +50, and +44. The comparison 

 values for the alcohol days are always minus, being —37, —107, —77, 

 — 83, —53, —52, and —87. The general average differences for these 

 two series are, respectively, +48 and —71. What is thus indicated by 

 the average differences will likewise be found to be true for the indi- 

 vidual periods 2, 3, 4, 5, and 6 for the pulse taken under the different 

 conditions from 1 to 7; that is, the differences for normal days have 

 usually the plus sign, while those for alcohol days are usually minus. 



Experimental periods 

 2 3 r 4 



Fig. 15. — Average duration of pulse cycle under experimental conditions 1 to 7 on normal and 

 alcohol days, as compared with pulse duration during word reactions (5 and 6). 



The effect of alcohol is found by deducting the normal difference 

 from the alcohol difference. These results are given for each of the 

 seven experimental conditions in table 20, and are also stated in terms 

 of per cent. They are likewise summarized in table 21, which shows by 

 periods the average effect of alcohol for each of the conditions. There 

 are only two values in the latter table which are preceded by the plus 



