Abstract

In Part IV of Book I of Hume’s Treatise Hume frequently appeals to an identity ascribing mechanism of the imagination. A psychological mechanism of which it is a special case, to ‘compleat the union’, is also prominent. These mechanisms belong to the imagination narrowly conceived according to a distinction in section ix of Part III. The role and significance of these mechanisms in the development of Hume’s scepticism is explored. Appreciation of their significance is also argued to cast light on Hume’s refusal to locate necessity in objects and to suggest a plausible explanation of his second thoughts about personal identity.