1246 
TxA BLUE fe 
| ‘ | | | 
| Number Arithm. Mean _ Gain after 
Observers of series | mean deviation Median _ 24 hours 
| | | 
| | | | 
(| 19 . | 1 | 92.40 15.67 87.45 
53. 
: | | 2428 r 43.38 | 6.91 44.55 | | 53.05 
ae ee 1 87.52 11.83 88.12 | 
| I | | | 47.44 
| 20 r | 46 8.48 43. 40 
‚|___20 fe Ne 16.15 57. DE 
| I | | 52.89 
5 20 r | 28.94 9.55 26.97 | 
an OET: 1 10.23 11.38 11.85 | 
| Il | | 60.17 
| 19 KNP, 6.54 26. ak 
Ee 47 114.40 32.36 | 86. sd 
| I | | 51.70 
8 20 r 55.26 | 13.54 | 55.41! 
8 1 97.54 21.19 | 89.23 
II | | 48.64 
8 r | 50.10 | 14.21 |. 43.20 
| ; | 
time with II (increase 14.32 perc). The learning-times of the 7-rows 
do not differ very much. For R and D they decrease with II 
(respectively 3.35 and 9.34 perc.) for M the increase is 6.04 perc. 
For M and D the time saved after 24 hours is greater with I 
(respectively 53.05; 47.44 and 51.70; 48.64 perc.); for R, however, 
considerably greater with II (52.89 and 60.17 perc.). i 
When summarising these data we see that the number of 
repetitions needed to learn the series by heart is larger with II 
than with I, in the learning- as well as in the repetition-experiments. 
The increase of the number of repetitions in the learning-experiments 
does not keep pace with that of the repetition-experiments, so that 
for two of our observers the gain after 24 hours is largest with 1, 
for the third with II. Again, with II the learning does not only 
require less time, the gain effected after 24 hours is also greater. 
The few exceptions may be accounted for by the unequal increment 
in the number of repetitions in the learning- as well as in the 
repetition-ex periments. 
The third Table gives the mean duration of the recitation-times 
(seconds) in the learning- and the repetition-experiments with I and 
II along with the gain effected after 24 hours in percentages. 
For all observers the recitation-time of the learning-ex periments 
is longer than that of the repetition-experiments, with I as well as 
