104 



Effect of Alcohol on Psycho-Physiological Functions. 



and plotted the two curves, the form and relationship of the curves 

 would be substantially like those of the curves in figure 12. 



The question which must be answered next concerns the first period 

 for the alcohol days. As the results are obtained before the alcohol is 

 taken, the data are normal, i. e., uninfluenced by alcohol. The natural 

 query would be : Are the changes in pulse rate during the first period of 

 alcohol days different from the changes during the first period of normal 

 days? The answer to this question will be found in figure 14. Here, as 



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Fig. 14. — Duration of pulse cycles given in hundredths of a second in first, secondhand third 

 periods on normal and alcohol days in pre-tetanus, tetanus, and post-tetanus divisions. 



in the preceding figure, light and heavy lines have been used to repre- 

 sent the data for alcohol and non-alcohol days, respectively. To sim- 

 plify the figure only 6 curves are incorporated, these representing the 

 averages for periods 1, 2, and 3 of the alcohol days and the same periods 

 for the non-alcohol days. The two continuous-line curves, one light 

 and the other heavy, for the first periods of the alcohol and normal 

 days, respectively, both represent normal data, since in each case the 

 records were taken preceding control or alcohol doses; these normal 

 curves must be given the first attention. In the pre-tetanus section 

 these curves lie very close together — closer in fact than any other two 

 curves of the six. The tendency for the same two curves to fall on 

 identical points is also prominent in the tetanus division of figure 14 



