Statement of purpose

This is a journal, not a diary. Diaries are kept by girls and tell all about their dates and what they think of their different boy friends. My mother says that men keep diaries too, that the most famous diary in the world was kept a long time ago by an Englishman named Pepys. That may be so, but when I read about pirates and explorers and sea captains they always keep journals, so this is going to be a journal. It is going to be a record of what happens to me this summer in New Jersey.

[Who wrote this? Which book?]