came in contact with the skin just after or before the intermediate
points. When the contacts were arranged in this way, the tendency to
underestimate the filled spaces was very much lessened, and with some
subjects the tendency passed over into a decided overestimation. This,
it will be seen, is a confirmation of the results in Table II.

I have already stated that the two series of experiments reported in
Section II. throughout point to the conclusion that an increase of
pressure is taken to mean an increase in the distance. I now carried
on some further experiments with short filled distances, making
variations in the place at which the pressure was increased. I found a
maximum tendency to underestimate when the central points in the
filled space were weighted more than the end points. A strong drift in
the opposite direction was noticed when the end points were heavier
than the intermediate ones. It is not so much the pressure as a whole,
as the place at which it is applied, that causes the variations in the
judgments of length. In these experiments the total weights of the
points were the same in both cases. An increase of the weight on the
end points with an equivalent diminution of the weights on the
intervening points gave the end points greater distinctness apparently
and rendered them less likely to disappear from the judgments.

At this stage in the inquiry as to the cause of the underestimation of
short distances, I began some auxiliary experiments on the problem of
the localization of cutaneous impressions, which I hoped would throw
light on the way in which the fusion or displacement that I have just
described takes place. These studies in the localization of touch
sensations were made partly with a modification of the Jastrow
æsthesiometer and partly with an attachment to the apparatus before
described (Fig. 1). In the first case, the arm upon which the