Gilbert Ryle’s 1949 The Concept of Mind is now famous above all as the origin of the phrase “the ghost in the machine” – a phrase Ryle used to attack the popular idea that our bodies and minds are separate. His own position was that mental acts are not at all distinct from bodily actions. Indeed, they are the same thing, merely described in different ways – and if one cuts through the confusing language of the old philosophical debates, he suggests, that becomes clear. While, in many ways, modern philosophers of mind have moved on from or discarded Ryle’s actual...