I do not employ researchers, nor did I conduct any primary research using the Internet. I need physical contact with my sources, and there's only one way to get it. To me every trip to a library or archive is like a small detective story. There are always little moments on such trips when the past flares to life, like a match in the darkness. On one such visit to the Chicago Historical Society, I found the actual notes that Prendergast sent to Alfred Trude. I saw how deeply the pencil dug into the paper.