The first experiment of this sort was a return selection from generation 6 (and 6½) of the minus selection series. The parents of generation 6 (Table 21) averaged -1.86 in grade; the average grade of their offspring was -1.56, a regression of 0.30. The range of the offspring extended from 0 to -2.50. Some low-grade offspring were chosen for a return selection series (Table 31). The mean grade of the selected pairs ranged from -0.37 to -0.87, their mean being -0.60. These parents produced 118 offspring, whose average grade was -1.28, a regression of 0.68 _in a direction contrary to that of the regression in the minus selection series_. The large amount of the regression might seem to imply that it was even more difficult to return toward the former state of the race (in the neighborhood of 0) than it had been to depart from it, but this can not be insisted on, because the number of individuals under observation is not sufficiently large. To test the reality and permanency of the reversed regression, the selection was repeated five additional times, altogether six successive return selections being made with the idea of undoing what had been effected by six original selections in an opposite direction. The result of the second successive return selection is shown in Table 32. The parents here were of grade -0.50 and they produced 19 offspring of the average grade -0.95, a regression of 0.45 _away from_ 0 as before. Table 33 shows the result of the third return selection. Individuals entered in Table 32 as offspring appear here as parents. Only those pairs which were of mean grade, -0.25 or -0.37, should really be regarded as a _third return selection_. They gave offspring with mean grades of -0.63 and -0.86 respectively, which show regression of 0.38 and 0.49 _away from_ 0. But Table 33 shows also the character of young produced by -1.12 and -1.25 parents in this same third return-selection generation, _i. e._, by _unselected_ parents of the generation in question. Their young also regress _away from_ 0—that is, in the direction of the original selection. The -1.12 parents produced -1.61 offspring, a regression of 0.49, while the -1.25 parents produced -1.35 offspring, a regression of 0.10. For Table 33 as a whole the regression _away from_ 0 averages 0.31. A fourth generation in the return-selection series is summarized in Table 34. The parents are of mean grade -0.63; their 50 offspring are of mean grade -1.17, a regression amounting to 0.54 _away from_ 0 and in the direction of the six generations of original selection. Table 35 contains the results of the fifth generation of the series. The parents are here of mean grade -0.65. The number of offspring is very small (13), but they nevertheless show the reversed regression which characterized the four preceding generations. Their mean was -0.75, a regression of 0.10 away from 0.