Margaret Cavendish, Duchess of Newcastle, was a prolific writer who worked in many genres, including poetry, fiction, drama, letters, biography, science, and even science fiction. Unlike most women of her day, who wrote anonymously, she published her works under her own name. Her significance as a rhetorical theorist has two main dimensions. First, she lived at a time when rhetoric itself and rhetorical theory were undergoing radical changes. Her writings provide a valuable source of information about some of these changes. Second, her ideas about the rhetorical tradition provide particular insight into the relationship of women to that tradition at a critical time in its history. Cavendish not only practiced rhetoric but also recorded her progress, including her fears and failures, and her rhetorical ideas must be understood in this context. No single work is devoted to a consideration of rhetorical theory; to discover her ideas one must...