Bertrand Russell's Bundle Theory of Particulars presents and evaluates Russell's arguments for two competing theories on the nature of particulars at different stages in his career: the substratum theory of particulars (1903-1913) and the bundle theory of particulars (1940-1948).

Through its original focus on Russell's little known metaphysics in the later part of his career, this study explains why Russell's theory of particulars is relevant today. It argues that a Russellian realist bundle theory is indeed the best explanation of similarities and differences that we observe...