Did you know that the Internet Archive has digitized wonderful wagon loads of interesting odds and ends?  Check it out:

Passing English of the Victorian era : a dictionary of heterodox English, slang and phrase : Ware, James Redding : Free Download & Streaming : Internet Archive.

Did you know that one of my characters, soon to appear in “Levi Levi and the Time Machine,” develops a quirk where he only speaks in outdated slang?

Well, he does.  I gotta study up.