_mabcdm_ 1 1=6 1 1 4 5 _ambcdm_ 2 2=6 5 2 1 3 3 3=6 2 3 5 4 4=6 3 3 4 2 5 5=6 6 15(?) 4 5 6 1=5 1 2 1 2 1 3 7 2=5 5 3 3 8 3=5 3 7 2 1 9 4=5 2 21(?) 2 5 3 10 1=4 9 4 3 11 2=4 3 9 4 1 7 12 3=4 3 19(?) 1 2 4 13 1=3 [107]5+3(?) 2 1 10 14 2=3 1 11(?) 3 8 15 1=2 6(?) 1 4 9 Total 19 48+75(?) 6 38 17 71 I. _Inhibition_ (1) There is considerable inhibition only when identicals are next to each other. (2) There is but little difference in the amount of inhibition when identicals are removed two and when removed three places. (3) The interference is greatest when 3d = 4th, 4th = 5th, and 5th = 6th figures, in which schemes it is almost equal in amount. (4) When identicals are adjacent, it is impossible to decide whether there be inhibition or fusion, _i. e._, whether one be inhibited and the other appear, or whether the figure seen be a fusion of the two (unless there is an omitted figure whose location is known to the subject). Its intensity does not serve as a clue, for the perception of the number demands the full concentration of the attention. II. _Substitution_ When the interference is not sufficiently great to cause inhibition, substitution may result. (1) In the majority of cases the substituted figure is a dissimilar not occurring in the number. (2) A preceding figure is frequently substituted. (3) Occasionally a figure is replaced by its similar, but this is not true of the homogeneous element. (Cf. with Ranschburg.) (4) Sometimes the next figure in the natural number series is substituted; as, 9 for 8, 6 for 5. (5) The figures containing straight lines (4, 7, and especially 1) are less subject to illusion; likewise the smaller numbers (1, 2, 3, 4). III. _Permutation_ The permutation represents the least interference. (1) The 4th and 5th figures are most often exchanged. (2) The figure is seldom permuted more than two places, and generally but one.