What Happens When Wickman Is Introduced To Darcy?

I don't recall that we ever get to see the introduction of Mr. Darcy's to Wickham. Mr. Darcy has known Wickham long before he ever met Elizabeth. In Ch. 35 Mr. Darcy writes a letter to Elizabeth trying to explain why Mr. Wickham was dropped from the will. In it he explains the history of Mr. Wickham using Mr. Darcy's late father, "With respect to that other, more weighty accusation, of having injured Mr. Wickham, I can only refute it by laying before you the whole of his connection with my family. " Mr. Wickham came from high society but Mr. Darcy is clearly not impressed with him.