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 in between. What do you learn? Is it as easy for an old person to form a habit as it is for a young person? Why? 7. If an old person has no old habits to interfere, can he form a new habit as readily as can a young person? 8. Cite evidence from your own experience to prove that it is hard for an old person to break up old habits and form new ones which interfere with the old ones. 9. Do you find that you are becoming "set in your ways?" 10. What do we mean by saying that we are "plastic in early years"? 11. Have you planned your life work? Are you establishing the habits that will be necessary in it? 12. Is it an advantage or a disadvantage to choose one's profession or occupation early? 13. Attention often interferes with the performance of a habitual act. Why is this? 14. If a man removes his vest in the daytime, he is almost sure to wind his watch. On the other hand if he is up all night, he lets his watch run down. Why?