LitCharts assigns a color and icon to each theme in The History of Tom Jones, a Foundling, which you can use to track the themes throughout the work.
Virtue vs. Vice
Marriage, Romance, and Economics
Appearance vs. Reality
Coming of Age
Storytelling, Literature, and Structure
Summary
Analysis
The narrator complains that he’s committed himself to the structure of beginning each book with a prologue, since they take a lot of work. He curses the first author to invent prologues. He admits his prologues sometimes have little to do with the action and could be inserted into a totally different book. Still, he admits that prologues serve a purpose. They give critics a chance to warm up their insults, like musicians tuning instruments. They also give lazy readers some pages that they can easily skip, since many people like saying they’ve read books more than they like actually reading them.
In this introductory chapter, the narrator again comments on the process of storytelling, complaining about the structure of the story that he is currently in the middle of telling. His comments that lazy readers will likely just skip his introductions show that concerns about the attention span of readers date back even to 1749, and probably much earlier.