  Darwinism identifies a core set of concepts, principles and methodological maxims that were first articulated and defended by Charles Darwin and which continue to be identified with a certain approach to evolutionary  questions.[1]  We will thus need to begin with Darwin’s Darwinism as articulated in On the Origin of Species in 1859. We will then examine these same themes as they have been discussed by evolutionary biologists and philosophers of biology from the beginnings of the Neo-Darwinian Synthesis to the present.  