100 Effect of Alcohol on Psycho-Phijsiological Functions. 



pulse cycles occurred; usually 9 cycles were obtained on this day. In 

 general the tetanus data beyond 7 cycles are very scattering for the 

 other days; and averages beyond this number would be of little value. 

 In the post-tetanus period, 21 cycles were usually counted, since at 

 about this point the pulse seemed to have returned to near the pre- 

 tetanus level. Two records were accidentally not completed at the 

 time of taking, i e., those of June 29, period 3, record 1, and for July 1, 

 period 5, record 2. The first record on July 2, period 6, was partially 

 illegible and not included; the second record for period 3, July 3, was 

 missing. 



Each record is represented by a line of values running horizontally 

 through the table. The averages and mean variations are given for 

 both the pre-tetanus and tetanus pulse cycles. For illustration, June 

 29, period 1, record 1, shows values for the pre-tetanus pulse cycles 

 beginning just before tetanus of 95, 93, 100, 100, 99, and 103, with an 

 average of 98 and a mean variation of 3. The values for the tetanus 

 period for the same record are 94, 77, 76, 73, 73, 73, and 71, with an 

 average of 77 and a mean variation of 5. There were just 7 cycles, 

 hence all are given. Immediately after tetanus, i. e., in the post- 

 tetanus period, we have cycle durations of 74, 83, 83, 76, 74, etc., until 

 we reach 106, 105, and 103. The fluctuations in the pulse-length in the 

 post-tetanus section are so large that averaging is of doubtful value. 

 In this table, as in previous tables, the data for the alcohol and normal 

 days are grouped separately. The line of averages under the records 

 for the individual days include only those periods following the taking 

 of the control or alcohol dose, i. e., all but the values for the first period. 

 The general averages given for the normal and the alcohol days are 

 drawn from the averages of the three normal days and the three alcohol 

 days, respectively. 



Attention may first be directed to the normal change of the heart 

 rate occasioned by the muscular effort of tetanus. The general aver- 

 ages for homologous pulse cycles on the non-alcohol days have been 

 plotted in the form of a curve and are shown in figure 12. The figure is 

 so drawn that a rise in the curve denotes a change to a shorter pulse 

 cycle (faster rate). In the column at the left durations in hundredths 

 of a second are given, and at the right their approximate equivalent in 

 terms of pulse rate per minute. The curve is divided by vertical lines 

 showing the pre-tetanus, tetanus, and post-tetanus sections. 



In examining the normal curve, we find that apparently relaxation 

 was not complete previous to the tetanus, as the pulse cycles were con- 

 tinuously lengthening before the point where the signal "go" was given. 

 The average duration for this section is 110, or 55 beats per minute. 

 From a pulse which is relatively relaxed, the transition is rapid after 

 the beginning of muscular work. The first cycle at the beginning of 

 tetanus shows a change from the average level of 110 to a level of 91, or 



