One hundred years ago, Roy Wood Sellars' "Evolutionary Naturalism" (1922) was published, a somewhat forgotten milestone in the development of a non-reductionist naturalism. Sellars did not yet speak of emergence but of "novelty", but saw the importance of systemic properties. He underestimated Darwin and the importance of studying animal behaviour, so some of his insights seem outdated. On the other hand, he was ahead of his time with ideas that are still valuable today. He therefore deserves a place in the development of evolutionary naturalism and in the history of philosophy in general.