This book investigates whether George Berkeley, traditionally viewed as an immaterialist, adopted a corpuscularian framework in his final philosophical work, Siris. Gabriel Moked, a scholar of early modern philosophy, analyzes Berkeley's later writings to argue that the philosopher developed a sophisticated and original theory of minute particles. By examining the transition from Berkeley's earlier radical idealism to the more nuanced physics presented in Siris, Moked challenges the conventional interpretation of Berkeley's intellectual trajectory. The work utilizes textual evidence from Berkeley's primary sources to reconstruct a coherent, albeit unconventional, corpuscularian physics.

Scholars of early modern philosophy recognize this text as a significant contribution to the re-evaluation of Berkeley's later thought. Readers frequently note the academic density of the prose, which requires a strong background in 18th-century metaphysics to fully grasp the author's arguments.