  The case for taking Locke to subscribe to realism looks  strong.[1] Remarks along very similar lines can also be found in Berkeley: in section 98 of The Principles of Human Knowledge (1710) he tells us that ‘Time therefore [is] nothing, abstracted from the succession of ideas in our minds’. Hume’s position on the origin of our concept of succession is likewise broadly similar to that of Locke. In Book 1, Part II(§3) of his Treatise (1739) he writes: