The Question and Answer section for Joseph Andrews is a great resource to ask questions, find answers, and discuss the novel.
Fielding uses the name Pamela for Joseph Andrew's sister, as a spoof to the character of Pamela in Samuel Richardson's novel by the same name. Fielding choice is sarcastic, though today's readers are likely unaware of the reason for his ridicule.
The absence of low?
I'm not sure what you mean by "accident". Are you referring to theabduction of the Wilsons' eldest son by gypsies?