And you see, he named me Mary-- But I mustn't tell that here.

That's part of the story, and this is only the Preface.

I'm going to begin it to-morrow--the real story--Chapter One.
But, there--I mustn't call it a "chapter" out loud.

Diaries don't have chapters, and this is a diary.

I mustn't forget that it's a diary.
But I can write it down as a chapter, for it's _going to be_ a novel, after it's got done being a diary..