In the original tests, the preliminary series indicated a strong preference for black. In series _A_ it was chosen on the average 5.8 times in 10, and in series _B_, 5.7 times. This preference was rapidly overcome by the training series, and at the end of 130 tests discrimination was perfect. All this appears in the curve of learning (solid line of figure). On the other hand, these preliminary series when repeated as memory tests, after a rest-interval of eight weeks, gave markedly different results. Series _A_ indicated preference for white (5.6 times in 10) instead of black, and series _B_ indicated only a slight preference for black. In brief, series _A_ and _B_ show that the preference for black was considerably stronger at the beginning of the training than at the beginning of the re-training. In the light of these facts it is fair to claim that the effects of the white-black training had not wholly disappeared as the result of eight weeks of rest, and that the experiment therefore fails to furnish satisfactory grounds for the statement that re-learning occurs more rapidly than learning. I accept this criticism as pertinent, although not necessarily valid, and at the same time I freely admit that the results have a significance which I had not anticipated. But they are not less interesting or valuable on that account. Granting, then, that at least some of the ten individuals which took part in the experiment had not completely lost the memory of their white-black training at the end of eight weeks, it is still possible that an examination of the individual results may justify some conclusion concerning the question which was proposed at the outset of the investigation. Such an examination is made possible by Tables 49 and 50, in which I have arranged separately the results for the males and the females. TABLE 49 WHITE-BLACK TRAINING. TEN TESTS PER DAY Males TRAINING RETRAINING 210 220 230 410 420 AV. 210 220 230 410 420 AV. A 6 5 6 6 6 5.8 5 4 5 4 3 4.2 B 6 8 8 5 1 5.6 8 4 5 4 6 5.4 1 6 7 6 2 4 5.0 3 3 4 7 3 4.0 2 4 3 1 2 3 2.6 2 4 2 5 3 3.2 3 3 1 4 3 4 3.0 1 4 1 4 1 2.2 4 5 0 3 3 2 2.6 0 1 0 1 2 0.8 5 3 0 4 1 4 2.4 0 2 0 2 0 0.8 6 2 1 4 0 1 1.6 0 1 0 0 2 0.6 7 1 0 3 1 0 1.0 0 0 0 0 8 0 0 1 0 0 0.2 0 0 1 0.2 9 0 0 0 1 0 0.2 0 0 0 10 0 0 0 0 1 0.2 11 0 0 0 0 0 12 0 0 0 0 13 0 0 14 15