479 

 TABLE I. Observer M. 



Groups 



I 



(20) 



II 



(20) 



1st 



interval 



2nd 



1st 



interval 



2nd 



Arithm. 

 mean 



0.82 

 0.82 

 1.31 

 1.29 

 0.80 

 0.83 

 0.96 

 0.94 

 0.84 

 0.88 

 0.80 

 0.78 



Mean 

 deviation 



Median 



0.06 

 0.05 

 0.16 

 0.10 

 0.06 

 0.06 

 0.05 

 0.06 

 0.09 

 0.12 

 0.09 

 0.06 



0.79 

 0.82 

 1.22 

 1.30 

 0.80 

 0.84 

 0.94 

 0.92 

 0.80 

 0.80 

 0.79 

 0.76 



mean duration of the syllables decreases in the order of the groups. 

 (M 0.96; 0.80; R 0.94; 0.73; 0.72; D 0.98; 0.79; 0.75). The 

 duration of the interval decreases a little with R; with D, however, 

 it rather increases. With a single exception only (insignificant for 

 R, more significant for D) the mean duration of the syllables is in 

 the repetition-experiments smaller than (he corresponding time-values 

 of the repetition-experiments. The relation of the lengths of the 

 intervals in the learning-, and in the repetition-experiments presents, 

 in the main, no uniformity. 



For M it decreases a little; for R the intervals increase, while 

 for D the first interval increases, the second decreases. Irrespective 

 of the exceptions just alluded to, it may here also be observed that 

 the acceleration, which the learning undergoes in the repetition 

 experiments, increases in the order of the groups. 



A comparison of the values for the mean deviation is of some 

 importance as it shows us in how far the rhythm, irrespective of 

 the peculiarities alluded to above, (acceleration in the order of the 

 g:roups etc.), remains constant. Now it is manifest that with I, as 

 well as with II, in tlie learning-as well as in the repetition-experi- 

 ments, the mean deviation is considerably greater for the intervals 

 than for the groups. This goes to show that the observer sticks 

 better to his rhythm in the groups tlian in the intervals. It also 



