aster the whole series. The very
favorable results which this method had yielded in the classroom made
me decide to try it in this case too. I chose for an experiment 24
pairs of words from the sphere of experience of the girls to be
tested. Two further class experiments belonged rather to the periphery
of psychology. The exactitude of space-perception was measured by
demanding that each divide first the long and then the short edge of a
folio sheet into two equal halves by a pencil mark. And finally, to
measure the rapidity of movement, it was demanded that every one make
with a pencil on the paper zigzag movements of a particular size
during the ten seconds from one signal to another.

After these class experiments I turned to individual tests. First,
every girl had to sort a pack of 48 cards into 4 piles as quickly as
possible. The time was measured in fifths of a second. The following
experiment which referred to the accuracy of movement impulses
demanded that every one try to reach with the point of a pencil 3
different points on the table in the rhythm of metronome beats. On
each of these three places a sheet of paper was fixed with a fine
cross in the middle. The pencil should hit the crossing point, and the
marks on the paper indicated how far the movement had fallen short of
the goal. One of these movements demanded the full extension of the
arm and the other two had to be made with half-bent arm. I introduced
this last test because the hitting of the right holes in the
switchboard of the telephone office is of great importance. The last
individual experiment was an association test. I called six words like
"book," "house," "rain," and had them speak the first word which came
to their minds. The time was measured in fifths of a second only, as
subtler experiments, for which hundredths of a second would have to
be considered, were not needed.

In studying the results so far as the memory experiments were
concerned, we found that it would be useless to consider the figures
with more than 10 digits. We took the results only of those with 8,9,
and 10 digits. There were 54 possibilities of mistakes. The smallest
number of actual mistakes was 2, the largest, 29. In the experiment on
attention made with the crossing-out of letters, we found that the
smallest number of correctly marked letters was 107, the largest
number in the six minutes, 272; the smallest number of overlooked
letters was 2, the largest, 135; but t