Ratio of 1st to 2d 5/12 3/12 2/12 Interval + = - + = - + = - 1.000: 1.057 95.0 0.0 5.0 100.0 0.0 0.0 100.0 0.0 0.0 1.000: 1.000 94.7 5.3 0.0 86.0 10.5 3.5 87.5 12.5 0.0 1.000: 0.895 40.0 60.0 0.0 46.2 49.6 3.3 74.1 18.5 7.4 1.000: 0.846 41.0 50.0 9.0 39.4 54.6 6.0 40.0 52.0 8.0 1.000: 0.800 20.0 60.0 20.0 13.0 70.0 17.0 53.8 46.2 0.0 1.000: 0.756 29.4 23.5 47.1 21.8 43.4 34.8 28.0 72.0 0.0 Av. for all ratios, 53.3 33.1 13.5 51.1 38.0 10.8 63.9 33.5 2.6 Within the limits of its appearance, as the figures just presented indicate, the force, definition and persistency of the rhythmical impression do not continue uniform. At the lowest rates at which rhythm appears the integration of the successive groups is weak and their segregation indistinct. As the rate increases the definition of the rhythmic form grows more precise, group is separated from group by greater apparent intervals, and the accentuation of the groups becomes more pronounced. In subjective rhythmization of an undifferentiated series, likewise, the impression of segregation and periodic accentuation grows more forcible and dominating as the rate increases. The sensitiveness to form and dynamic value in the successive groups also increases up to a certain point in the process of acceleration. As expressed in the capacity to discriminate departures from formal equivalence among the groups, this function reached its maximum, for those concerned in this investigation, at rates varying individually from 0.3 sec. to 0.6 sec. in the value of their intervals.