While Curley argues that we need to know the history of philosophy so as not to avoid important alternatives to contemporary proposals, I argue that philosophy is an essentially historical enterprise. Unlike science, philosophy cannot forget its history. Not to know the history of philosophy is not to understand why the questions we seek to answer are worth answering or asking.

Leibniz's claim that a substance which is simple perceives is examined in terms of the cartesian model of mind which leibniz adopted. This examination helps to explain some of leibniz's claims about perception. Although leibniz can account for perception while maintaining that the substance which perceives is simple, He cannot adapt the cartesian model to encompass his broadened understanding of perception which includes unconscious perceptions in monads which apperceive nothing.