1252 
those of table IX to the time-values, expressed in seconds. The 
data for D with II,-being too small numerically could not be tabulated. 
Table VIII clearly shows that the influence of practice reveals 
itself in a decrease of the number of repetitions. With I the number 
of repetitions required to learn the series by heart is smaller in 
the second group than in the first, (for M 10 °/,; R 33 °/, and 
D 17.93 °/,.) With II a similar gain is effected (for M 22 perc. 
for D 15 pet.). For the former, therefore, the influence is greater, 
for the latter, smaller with II than with I. 
The values obtained in the repetition-experiments are not suitable 
for comparison as their significance depends for the greater part on 
their relation to those of the learning-experiments. We, therefore, 
TABLE Ix. 
Observers | Groups | Arithm. mean Mean deviation Median 
| | | 
bed 90.25 | 16.54 86.95 
| ist | | 
| ¢ 36.02 5.89 41.15 
| RA | 4 94.55 14.80 94,37 
iar 50.75 RH 49.92 
M. { | 
| 97.11 10.48 100.37 
st 
doen r 53.31 11.23 . 49.62 
1 71.99 13.18 80.47 
2d | | 
r 38.69 5.74 _ 30.92 
etl 15.43 21.16 66.65 
/ Ist 
Ni r 28.56 8.80 26.80 
| rene 47.44 11.15 51.82 
| 2d | | | 
E a) 20.32 10.31 21.33 
4 ft 8-08 12.13 74.25 
1 | st | | | 
dj | | ni | 31.21 8.84 28.90 
| 1 61.64 10.64 62.85 
2d {| 
r 24.74 4.25 23.60 
ft decd 138.19 42.22 133.60 
Ist 
i ; ior 68.70 12.74 65.02 
| Ee | 1 90.61 22.50 79.70 
| WE oe eee Ter 14.35 33.02 
