42 Effect of Alcohol on Psycho-Physiological Functions. 



4.4 and 14.8 mm.), in strict accuracy should be placed under periods 

 5 or 6, or in an intermediate position between these two. On June 29 

 only four repetitions of all the measurements could be accomplished in 

 the 5-hour session, as compared to the six periods on three of the other 

 days. It did not seem feasible, however, to distribute the fewer meas- 

 urements for June 29 and 30 and July 1 so that they would correspond 

 in point of time with the averages for the periods on the other days. 

 The values have therefore been entered under columns by periods rather 

 than an attempt made to specify more exactly the number of minutes 

 which elapsed between the measurements and the dose. The aver- 

 ages of the values for L and A obtained after the dose {%. e., in periods 

 2 to 6) are given in the last two columns of the table. Thus, L, 34 <r, 

 June 29, is an average for 34, 32, and 35 a. The averages in black type 

 represent the group averages for the period values in each column, the 

 30-gram and 50-gram reflexes being averaged separately. If the 

 reader will consult the general averages in the last two columns of the 

 table in section i, these values will be found : 



Normal days, L, 30 grams, 35 <r, 50 grams, 34 o~; alcohol days, L, 30 

 grams, 35 <r, 50 grams, 34 <r. 



Normal days, A, 30 grams, 8.5 mm., 50 grams, 18.2 mm.; alcohol 

 days, A, 30 grams, 8.4 mm., 50 grams, 18.8 mm. 



That is, these average values, which do not include the measure- 

 ments taken on the first periods on any of the days, show for the groups 

 as a whole almost identical latencies and amplitudes for the respective 

 intensities of stimulation. It is inconceivable that with normal experi- 

 ments the average values could have been more nearly identical, but 

 this is not true of the data when studied and compared by periods. 



Section n naturally shows no differences under period 1, for, as will 

 be recalled from the explanation of the illustrative table 2, the value for 

 this period is used as the normal of the day and is subtracted from those 

 obtained in the other periods. Thus, 32 a (the normal value for L in 

 period 1, June 29) is deducted from 34 a for L in period 2 on the same 

 day, yielding a difference of +2 a (see first normal difference for June 

 29). The average difference in amplitude for this same group of 

 reflexes is obtained by deducting A, 9.1 mm. (period 1, June 29) from 

 A, 9.2 mm. (period 2, June 29), giving a difference for the second period 

 of +0.1 mm. The differences for the other periods and for all the days 

 are found in like fashion. These differences are averaged for each day 

 and for each stimulus intensity ; the results are shown in the last two col- 

 umns of the table. The average differences in the heavy-faced type are 

 in every case for the differences in the vertical columns above them. In 

 finding these averages the signs have been taken into account. The series 

 of averages for normal differences in section n, i.e., 30 grams, +0.3, +0.7, 

 + 1.3, +1.5, +1.0 o~, indicate that with this stimulus the latent time of 

 the patellar reflex for a normal day tends to increase gradually, on the 

 average, for three or four hours after the beginning of the measure- 



