This book offers a provocative interpretation of the theory of the soul in the writings of the French Cartesian, Nicolas Malebranche (1638-1715). Though recent work on Malebranche's philosophy of mind has tended to emphasize his account of ideas, Schmaltz focuses rather on his rejection of Descartes' doctrine that the mind is better known than the body. In particular, he considers and defends Malebranche's argument that this rejection has a Cartesian basis. Schmaltz reveals that this argument not only provides a fresh perspective on Cartesianism but also is relevant to current debates in the philosophy of mind.