KNOWLEDGE The title page of the first edition of Hume’s Treatise which ‘fell dead-born from the Press’ straight line, or leap oV from the second in any line or direction? All these suppositions are consistent and conceivable’ (E II 30) The answer, obviously enough, is that we learn the regularities of nature from experience But Hume carries his probe further Even after we have experience of the operations of cause and eVect, he asks, what ground is there 155