TABLE LXVIII.
Stress.First Half.Second Half
Initial,1.0000.794¹
Median,1.0000.668
Final,1.0000.770

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 coördination 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 coördination 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,1.0000.846¹
Median,1.0001.064
Final,1.0000.742

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:

TABLE LXX.
Stress.Interval I.Interval II.Interval III.
Initial,5.82per cent.6.45per cent.4.65per cent.
Median,9.95"7.87"4.70"
Final,11.95"9.77"7.15"