ft hand, and mirror writing. The
latter is performed by standing a mirror vertically on the table,
placing the paper in front and writing in such a way that the letters
have the proper form and appearance when seen in the mirror. The subject
should not look at his hand but at its reflection in the mirror. A piece
of cardboard can be supported just over the hand so that only the image
of the hand in the mirror can be seen.

2. A study of the interference of habit can be made as follows: Take
eight small boxes and arrange them in a row. Number each box plainly. Do
not number them consecutively, but as follows, 5, 7, 1, 8, 2, 3, 6, 4.
Make eighty cards, ten of each number, and number them plainly. Practice
distributing the cards into the boxes. Note the time required for each
distribution. Continue to distribute them till considerable skill is
acquired. Then rearrange the order of the boxes and repeat the
experiment. What do the results show?

3. Does the above experiment show any transfer of training? Compare the
time for each distribution in the second part of the experiment, _i.e._
after the rearrangement of the boxes, with the time for the
corresponding distribution in the first part of the experiment. The
question to be answered is: Are the results of the second part of the
experiment better than they would have been if the first part had not
been performed? State your results and conclusions and compare with the
statements in the text.

4. A study of the effects of spreading out learning periods can be made
as follows: Divide the class into two equal divisions. Let one division
practice on a substitution experiment as explained in Exercise 1, for
five ten-minute periods of practice in immediate succession. Let the
other division practice for five days, ten minutes a day. What do the
results indicate? The divisions should be of equal ability. If the first
ten-minute practice period shows the sections to be of unequal ability,
this fact should be taken into account in making the comparisons. Test
sheets can be prepared by the teacher, or they can be obtained from the
Extension Division of the University of Missouri.

5. An experiment similar to No. 4 can be performed by practicing adding
or any other school exercise. Care must be taken to control the
experiment and to eliminate disturbing factors.

6. Try the card-distributing experiment with people of different ages,
young children, old people, and various ages i