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Hume on unobservable entities

It is generally acknowledged by both philosophers of science and by Hume scholaras that Hume’s classic analysis of perceptions and knowledge of matters of fact push strongly toward scepticism about unobservable entities, such as those typically postulated in theories of the natural sciences. Intriguingly, though, Hume has not only written approvingly of certain scientific theories referring to unobservable objects, but also introduced himself several hypotheses about unobservable entities and processes in his own “science of man”. This article aims to pinpoint and comment some of the main passages of his works in which Hume appears to take a positive stance toward unobservables, in certain particular instances. If correct, this analysis would constitute a piece of evidence against the usual belief that the empiricist epistemological theory developed by Hume would constitute an impeditive framework for any form of scientific realism.