[Footnote 1: In the study of the reactions furnished by our normal subjects it was possible to analyze the record of any subject only by removing it from the mass of material which forms our tables, and using as the standard of comparison the reactions of the remaining 999 subjects.] In order to determine the influence of age, sex, and education upon the tendency to give reactions of various values, we have selected three groups of subjects for special study: (1) one hundred persons of collegiate or professional education; (2) one hundred persons of common school education, employed in one of the State hospitals as attendants, but not as trained nurses; and (3) seventy-eight children under sixteen years of age. The reactions given by these subjects have been classified according to frequency of occurrence into seven groups: (a) individual reactions (value 0); (b) doubtful reactions (value ±); (c) reactions given by one other person (value 0.1 per cent); (d) those given by from two to five others (value 0.2--0.5 per cent); (e) those given by from six to fifteen others (value 0.6-1.5 per cent); (f) those given by from sixteen to one hundred others (value 1.6--10.0 per cent); and (g) those given by more than one hundred others (value over 10.0 per cent). The averages obtained from these groups of subjects are shown in Table 1, and the figures for men and women are given separately. TABLE I Value of reaction 0 ± 0.1 0.2-0.5 0.6-1.5 1.6-10 >10 Sex Number % % % % % % % of cases Persons of M.. 60 9.2 1.8 5.2 9.7 11.0 27.8 85.5 collegiate F... 40 9.5 1.8 8.0 9.8 11.7 28.0 83.4 education Both 100 9.3 1.8 4.7 8.7 11.8 28.2 34.4 Persons of M.. 50 5.8 1.6 8.6 8.3 10.2 81.6 88.7 common school F.. 50 4.6 1.8 8.8 7.1 9.4 82.0 42.1 education Both 100 5.2 1.4 3.5 7.7 9.8 81.8 40.4 School children M... 33 5.9 0.8 4.2 8.7 10.0 28.6 88.5 under 16 Jr. F.. 45 5.0 1.0 4.6 9.8 11.0 80.1 36.7 years of age Both 78 5.7 1.4 4.6 9.8 11.2 29.4 87.4 General average. Both.1000 6.8 1.5 It will be observed that the proportion of individual reactions given by the subjects of collegiate education is slightly above the general average for all subjects, while that of each of the other classes is below the general average. In view, however, of the wide limits of variation, among the thousand subjects, these deviations from the general average are no larger than might quite possibly occur by chance, and the number of cases in each group is so small that the conclusion that education tends to increase the number of individual reactions would hardly be justified. It will be observed also that this comparative study does not show any considerable differences corresponding to age or sex.