The book also includes lots of Americanisms of the period, sayings that struck the British of the time as odd and needing explanation.
Here are two Americanisms, for example: "gaze at the melody" (a variation on "face the music"), and "gee-ru" (euphemistic shortening of "Jerusalem"):
There is also boys' school slang, like this entry about "brolly" as slang for umbrella:
Poke around, and you can find all sorts of things. If you want to tell a story with some good 19th-century slang in it, this is a book that can help!