It must be distinctly understood that these "threshold means" are not displacements, and that the two cannot be compared as if they were statements of the same facts. These _means_ indicate the centre of gravity of the "click first" "click last" interval with respect to the visual stimulus. Changes in this centre of gravity may reasonably be expected to approximate a variation _inverse_ to that of the displacements of the auditory stimulus. For example, any change in the conditions which would tend to increase a _negative_ displacement would tend also to put the centre of gravity of the "click first" "click last" interval _after_ the visual stimulus, or, if it were already after, to increase its time after. So also the _positive_ displacement and the position of the threshold mean _before_ the visual stimulus may be considered similar indications. For a click given at the time of the threshold mean of a given observer, in connection with the same visual stimulus, would certainly be judged by that observer as simultaneous with the visual stimulus. If, then, this mean is before the visual stimulus, the sound will be displaced positively, _i. e._, coördinated with a visual stimulus coming later. If the mean is after the visual stimulus, the sound will be displaced negatively, _i. e._, coördinated with a visual stimulus coming earlier. The position of the mean of the thresholds indicates a tendency toward the displacement of the auditory impression in the opposite direction. In Table III, three out of five observers, A, Sh, and Bo, show a change from a negative displacement in the series of three to a positive displacement in the series of twelve. If this were the effect of the series, the same should show in the series of three as compared with the single letter. Such a change is manifest in the results of Bo. It is, however, very slight. The others increase the negative displacement from the single letter to three letters. In Table IV, of the same three observers represented, Sh changes the threshold mean from _after_ in the three-letter series to _before_ in the twelve-letter series, and A changes from _after_ in one letter to _on_ in three letters. These changes correspond to changes from negative to positive displacements for increase of series and introduction of series. G shows the same change from one letter to three, in both tables. These changes, in 55% of the cases offered for comparison in the two tables, indicate a _decrease_ of _negative displacement_ and an _introduction_ of _positive displacement_ as the _effect_ of the _visual series_. The visual element is made more focal in expectant attention as it is more isolated, and so the tendency toward negative displacement and increasing negative displacement as the serial character of the visual impressions is stripped off. But there are strong counteractive tendencies, which control the 45% of comparisons not mentioned above,