Many of the subjects visualize a time line in the form of a curve. In each case of this kind the introduction of a change, either in intensity or location, if large enough to produce an effect on the time estimation, produced a distortion on the part of the curve corresponding to the interval affected. All of the subjects employed in the experiments of Group 2 were distinctly conscious of the change in attention from one point to another, as the two were stimulated successively, and three of them, _Hy_, _Hs_ and _P_, thought of something passing from one point to the other, the representation being described as partly muscular and partly visual. Subjects _Mr_ and _B_ visualized the two hands, and consciously transferred the attention from one part of the visual image to the other. Subject _Mr_ had a constant tendency to make eye movements in the direction of the change. Subject _P_ detected these eye movements a few times, but subject _B_ was never conscious of anything of the kind. All of the subjects except _R_ were conscious of more or less of a _strain_, which varied during the intervals, and was by some felt to be largely a tension of the chest and other muscles, while others felt it rather indefinitely as a 'strain of attention.' The characteristics of this tension feeling were almost always different in the second interval from those in the first, the tension being usually felt to be more _constant_ in the second interval. In experiments of the third group a higher degree of tension was felt in awaiting a light tap than in awaiting a heavy one. Evidently, in all these cases, the effect of a _difference_ between two stimulations was to introduce certain changes in sensation _during_ the interval which they limited, owing to the fact that the subject expected the difference to occur. Thus in the third group of experiments there were, very likely, in all cases changes from sensations of high tension to sensations of lower, or vice versa. It is probable that, in the experiments of the second group, there were also changes in muscular sensations, partly those of eye muscles, partly of chest and arm muscles, introduced by the change of attention from one point to another. At any rate, it is certain that there were certain sensation changes produced during the intervals by changes of locality.