In Table 41 are to be found the average number of errors in each series of ten white-black discrimination tests for five males and for five females which were trained by being given ten tests per day, and similarly for the same number of individuals of each sex, trained by being given twenty tests per day. Since the results for these two conditions of training are very similar, the averages for the twenty individuals are presented in the last column of the table. For the present we may neglect the interesting individual, sex, and age differences which these experiments revealed and examine the significant features of the general averages, and of the white-black discrimination curve (Figure 29). TABLE 41 WHITE BLACK DISCRIMINATION TESTS. NUMBER OF ERRORS IN THE VARIOUS SERIES MALES FEMALES AVERAGES AVERAGES GENERAL AVERAGES AVERAGES GENERAL AVERAGES SERIES FOR 5, FOR 5, AVERAGES FOR 5, FOR 5, AVERAGES FOR ALL 10 TESTS 20 TESTS FOR 10 10 TESTS 20 TESTS FOR 10 (20) MALES PER DAY PER DAY PER DAY PER DAY AND FEMALES A 5.8 6.0 5.9 5.8 5.8 5.8 5.85 B 5.6 6.2 5.9 5.8 5.6 5.7 5.8 1 5.0 5.0 5.0 5.6 4.6 5.1 5.05 2 2.6 4.6 3.6 4.4 5.0 4.7 4.15 3 3.0 3.4 3.2 3.4 3.4 3.4 3.3 4 2.6 3.8 3.2 2.4 2.2 2.3 2.75 5 2.4 2.0 2.2 2.6 1.8 2.2 2.2 6 1.6 1.6 1.6 1.0 2.2 1.6 1.6 7 1.0 1.4 1.2 2.0 0.4 1.2 1.2 8 0.2 0.6 .4 1.4 1.6 1.5 .95 9 0.2 1.0 .6 0.6 0.8 .7 .65 10 0 .8 .4 1.0 0.8 .9 .65 11 0 .8 .4 0.8 0 .4 .40 12 0 .6 .3 0.4 0 .2 .25 13 0 0 0 0 0 0 0 14 0 0 0 0 0 0 15 0 0 0 0 0 0 [Illustration: FIGURE 29.--Error curve plotted from the data given by twenty dancers in white-black discrimination tests. The figures in the left margin indicate the number of errors; those below the base line, the number of the series. _A_ and _B_ designate the preference series.]