In talking with Provis/Magwitch, what does Herbert learn about the convict’s wife? How does Pip figure out that Provis is Estella’s father?

Herbert learns that Magwitch's wife was a murderess with a small daughter. Pip puts two and two together abd bases his knowedge on what he knows about Estella's parentage, how Miss Havisham acquired her "daughter" and Magwitch's informations.