Naturalism, the purported derivation of values from facts, is a fallacy which stubbornly persists despite all attempts to root it out. And nowadays the naturalists seem to be getting the upper hand. It has become a commonplace of contemporary thinking, both in ethics and the philosophy of science (social and even natural), that the fact-value distinction has ‘broken down’. As early as 1955, J. L. Austin spoke disparagingly of the ‘fact/value fetish’; three years later, Philippa Foot referred to the ‘disappearance’ of the logical gap between factual premises and moral conclusions. In the following decade, Jonathan Cohen baldly asserted that ‘the statement/evaluation dichotomy is erroneous’; and John Searle produced a famous paper which set out to demolish the ‘alleged’ and ‘not very useful’ distinction between descriptive and evaluative utterances. More recently we find Benjamin Gibbs telling us that the ‘positivist doctrine of a fact-value dichtomy’ is ‘only a sort of myth’; while Richard Rorty asserts that the ‘positivist distinction between facts and values’ is based on a ‘philosophical fiction’. Finally, Roy Bhaskar goes so far as to pronounce that ‘the transition from “is” to “ought”, factual to value statements, indicatives to imperatives’ is ‘not only acceptable but mandatory’ !