and forth under it, the measurement by joint and muscle sensations was
eliminated.

It will be observed that no uniform motion could be secured by simply
manipulating the lever with the hand. But uniformity of motion was not
necessary for the results at which I aimed here. Dresslar has laid
great stress on the desirability of having uniform motion in his
similar experiments. But this, it seems to me, is precisely what is
not wanted. With my apparatus, I was able to give widely different
rates of speed to the block as it passed under the finger-tip. By
giving a slow rate for the filled space and a much more rapid rate for
the open space, I found again that the subject relied hardly at all on
the touch sensations that came from the finger-tip, but almost
entirely on the consciousness of the amount of time consumed in
passing over the spaces. The judgments were made as in the previous
experiments with this apparatus. When the subject reached the point in
the open space which he judged equal to the filled space, he slightly
depressed his finger and stopped the moving block. In this way, the
subject was deprived of any assistance from arm-movements in his
judgments, and was obliged to rely on the tactual impressions received
at the finger-tip, or on his time sense. That these tactual sensations
played here also a very minor part in the judgment of the distance was
shown by the fact that these sensations could be doubled or trebled by
doubling or trebling the amount of space traversed, without
perceptibly changing the judgment, provided the rate of speed was
increased proportionately. Spaces that required the same amount of
time in traversing were judged equal.

In all these experiments the filled space was presented first. When
the open space was presented first, the results for four out of five