I 



(18) 



II I 



(8) 



481 

 TABLE III. Observer D. 



Groups 



Arithm. mean 



Mean deviation Median 



1st 



interval 





2nd 



interval 



3rd 



1st 



interval 





2nd 



interval 



3rd 



R there is always a progressive increase, viz. it is larger from B 

 to C than from A to B, whereas for D there is in two eases a 

 decrease, in one case an increase from A to B. The tendency of the 

 rhythm to accelerate in the order of the groups is maintained also 

 with a greater familiarity with the material. For M and D the time 

 invariably decreases from the first to the last group; for R the 

 time-values of the third group are always smallest, whereas those 

 of the tirst are sometimes smaller, then again greater than those of 

 the second. 



In comparing the time-values of the intervals from A to C and 

 from 1 to 3, again a certain uniformity is to be observed. With 

 R there is without exception an increase from A to C; with M the 



