From this large array of facts certain findings seem to be significant, taking these measurements as a group. First, the sense of pitch, the sense of loudness, and the sense of time reveal no distinctly significant differences in racial groups, in culture-levels, or at age-levels, when adequately measured. In many cases this holds also for the sense of rhythm and tonal memory. This is probably indicative of the fact that the basic capacities for hearing in individuals now living and capable of being tested adequately are physiologically at the same level. This conclusion is in harmony with the observation that these capacities which function in music, function also in the vast varieties of orientation through sound at all levels of man now living. It is also analogous to what has been found in vision. Second, it develops that in each and every one of the groups studied there are enormous individual differences in each of these capacities and that the extent and distribution of these differences do not differ significantly from what we find in the public school children of the United States. Third, where comparisons of capacity and achievement have been made reliably, it has been found that those who have achieved distinction in music have these capacities in a significantly corresponding degree; but much larger numbers of those possessing superior capacity who have not been discovered as musical, either by themselves or in their environment, are revealed. This fact rules out many of the statistical studies of heredity in terms of musical achievement. Fourth, these capacities represent relatively independent factors in hearing. Fifth, marked superiority or inferiority in these capacities is of predictive value for musical achievement and guidance in education. On the motor side but little progress has been made. Principally because the measurements are laborious, significant elements have not been identified, and moderate motor capacities in speed and action are adequate for most musical achievements. Daily observations reveal that children may be slow and accurate, slow and erratic, fast and accurate, or fast and erratic in various degrees and combinations. It would, however, be of musical significance to discover to what extent and in what manner these traits are inherited from generation to generation.