I seem to be mentioning books tonight. "Alfred Russel Wallace - a life" by Peter Raby (Pimlico 2001). Wallace and Darwin presented a joint paper at the Royal Society. They had corresponded for several years and so they had influenced each other's ideas. The author argues that Darwin was upper crust and Wallace was working class. Hence Darwin, rather than the two of them, is remembered as the originator of the idea of selection's role in evolution. The Wallace line through the East Indies is named after our hero. Fallible, you're right about Darwin of course.