TABLE LXVII.

Rhythm Form.     Single Interval.  3-Beat Group.  6-Beat Group. 
Initial Stress,     1.000            1.214          1.037
Median   "          1.000            0.422          0.319
Final    "          1.000            0.686          0.524

A comparison of the second and third columns of the table shows an excess of mean variation of the smaller group over that of the larger in each of the three forms.  It is true also of the individual subjects except in two instances, in each of which the two indices are equal.  This proportion is broken in the relation of the primary interval to the unit group in the dactylic rhythm form.  A similar diversity of the individual records occurred in the two-beat rhythms.

The same indication of higher groupings appears here as in the case of previous rhythms.  Rhythmical variations are presented in the amount of the mean variations for alternate groups of three beats.  Chronologically in the records, as well as in dependence on theoretical interpretation, the first member of each higher group is characterized by the greater instability.  The amounts of this difference in cooerdination between the first and last halves in series of six beats is set down for the three rhythm forms in the following table: 

TABLE LXVIII.

Stress.      First Half.     Second Half
Initial,      1.000          0.794¹
Median,       1.000          0.668
Final,        1.000          0.770

¹These figures are made up from the records of three out of four subjects.  In the exceptional results of the fourth subject no mean variation appears in the first half and 6.3 per cent, in the second, making the average for the whole group 1.000:1.023.

There is still other evidence of higher rhythmical grouping than these oscillations in the amount of the mean variation of alternate groups.  Exactness of cooerdination between the individual intervals of successive groups might undergo development without affecting the relative uniformity of such total groups themselves.  But, throughout these results, an increase in cooerdination between the periods of the whole group takes place in passing from the first to the second member of a composite group.  The relation here is not, however, so uniform as in the preceding case.  The series of proportional values is given on page 403.

TABLE LXIX.

Stress.     First Half.     Second Half. 
Initial,     1.000          0.846¹
Median,      1.000          1.064
Final,       1.000          0.742

¹ Here also the records of three subjects only are involved, the results of the same reactor as in the preceding cases being discarded.  Including this, the ratio becomes 1.000:1.016.

The index of mean variation for the individual elements of the group also shows a progressive decrease from first to last as follows: