3. Why does a baseball curve?
4. Why did the American colonies revolt against England?
5. Why did the early settlers of New England persecute the Quakers?
6. Why should trees be planted either in early spring or late autumn?
7. Why do we lose a day in going from America to China?
8. In laying a railroad track, why is there a space left between the ends of the rails?
+Theme LXXXVI.+—Choose one of the above or a similar question as a subject for a theme. Write out as complete and exact an explanation as possible.
EXERCISE
Write out a list of subjects the explanation of which would not answer the questions why? or how? How many of them can you explain?
+Theme LXXXVII.+—Write out the explanation of one of the subjects in the above list.