ed in the classroom made
me decide to try it in this case, too. I chose for an experiment
twenty-four pairs of words from the sphere of experience of the girls
to be tested." (For instance, "door, house"; "pillow, bed"; "letter,
word"; "leaf, tree"; "button, dress"; "nose, face"; "cover, kettle";
"page, book"; "engine, train"; "glass, window"; "enemy, friend";
"telephone, bell"; "thunder, lightning"; "ice, cold"; "ink, pen";
"husband, wife"; "fire, burn"; "sorry, sad"; "well, strong"; "mother,
child"; "run, fast"; "black, white"; "war, peace"; "arm,
hand."--_Editor's note._)

[Sidenote: _Test for Exactitude_]

"Two class experiments belonged rather to the periphery of
psychology.

"The exactitude of space-perceptions 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.

[Sidenote: _Test for Rapidity of Movement_]

"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 forty-eight cards into four
piles as quickly as possible. The time was measured in fifths of a
second, with an ordinary stop-watch.

[Sidenote: _Test for Accuracy of Movement_]

"The following experiment which referred to the accuracy of movement
impulses demanded that every one try to reach with the point of a
pencil three 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.

[Illustration: TESTING STEADINESS OF MOTOR CONTROL--INVOLUNTARY
MOVEMENT PRIVATE LABORATORY, SOCIETY OF APPLIED PSYCHOLOGY]

"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, with an ordinary stop-watc