The book divided into two volumes—why? What are the structural differences between the two halves of the book, and why do they matter?

The novel is split into two parts or volumes. The author begins the novel with thirty-two letters. Sadly, after Pamela is forbidden to write her parents, she begins a journal, detailing her activities and persecutions. The letters and journal entries vary in length, and many of the journal entries and letters are filled with description. Others, however, are short, clipped, and vague. The biggest difference between the letters and entries can be found in the way Pamela writes. When she's writing to her parents, there is often a sense of urgency. In her journal, the events become more matter-of-fact.