KARL Bei 
‚Number Arithm. ~ Mean . Gain after 
Observers of series mean deviation Median 24 hours 
| 
1 | 20 | 13.61 3.01 12237 
| I | | 13.74 
En 20 r 11.74 2.24 10.95 
| 20 | 11.49 2.19 10.47 
II | 4.96 
20 r 10.92 2.25 10.07 
20 | 11.95 3.13 11.25 
I | 2.43 
5 20 r 11.66 2,21 11.65 
19 I 13.92 4.57 12.63 | 
II | 19.04 
20 r Tie 2562 10.65 
| 17 1 11.54 1.98 HELO 
I | 14.30 
Z 20 r 9.89 1.79 9.30 
8 I 11.15 2.98 10.78 
u | | 3.14 
8 r 10.75 1.95 10.45 
| 
with Il. M. and D recite quicker with II. R, on the contrary 
quicker with I. This at least is the case in the learning-experiments. 
The recitation of the repetition-experiments lasts longer with II than 
with I only in the case of D. The column of percentages of repeti- 
tions saved after 24 hours with I and II clearly shows that the 
gain is greater with I for M and D; for R however, with II. 
— Consequently the recitation-time with I as well as with IL is 
longer in the learning-experiments than in the repetition-experiments. 
Again, as 1o furthering a quick recitation the experimental method 
seems to have the advantage over the natural, whereas the latter 
yields a greater gain. 
The mean rate of succession of the presentations of the series 
of the second group, measured from the moment when the first 
syllable appeared in the slit of the mnemometer to the appearance 
of the last was 9,5 seconds. The next table shows how the observers 
themselves determined spontaneously the rate of succession in the 
learning- and the repetition-experiments. We determined accordingly 
the mean duration of a repetition in the learning- and in the 
repetition-experiments. The first column gives the number of repetitions, 
from which the time-values have been calculated. 
For R. and D. the mean duration of a repetition is markedly 
