Disappointed by the public reception to 'A Treatise of Human Nature', published anonymously between 1739 and 1740, David Hume decided to produce a shorter more polemic version of that work nearly ten years later. That revision, which was published in 1748, would be entitled 'An Enquiry Concerning Human Understanding'. Dispensing with much of the extraneous material from the 'Treatise', Hume focuses on his more vital propositions in the 'Enquiry'....