Abstract
Recent trends in philosophical naturalism have their chief source in Quine's influential call to 'naturalize' epistemology, which recommended that philosophical concerns be seen as simply one part of a scientifically informed attempt to understand the natural world. The result is the view described as 'scientific naturalism' where philosophy now must defer to science when addressing questions of knowledge, meaning and existence. This naturalist turn is sometimes portrayed as a novel and radical transformation of philosophy, one that holds the promise of genuine philosophical progress. However, there have been many other twentieth century American philosophers trained in different contexts and issues who have been..