title: Darwin's Methodological Evolution.
abstract: A necessary condition for having a revolution named after you is that you are an innovator in your field. I argue that if Charles Darwin meets this condition, it is as a philosopher and methodologist. In 1991, I made the case for Darwin's innovative use of "thought experiment" in the Origin. Here I place this innovative practice in the context of Darwin's methodological commitments, trace its origins back into Darwin's notebooks, and pursue Darwin's suggestion that it owes its inspiration to Charles Lyell.
authors.affiliation: Center for Philosophy of Science, 817 Cathedral of Learning, University of Pittsburgh, Pittsburgh, PA, 15260, USA, jglennox@pitt.edu.
authors.forename: James G
authors.initials: JG
authors.lastname: Lennox