centre for Quaker activity, and to proselytise actively was thus particularly bold and courageous. Her life from the age of twelve (when she suffered a period of fever) was marked by the recurrence of severe migraines. These meant that she was often incapacitated by pain, and she spent much time under medical supervision and searching for a cure (at one point even having her jugular veins opened). She had medical advice from Dr. Thomas Willis. Conway was famously treated by many of the great physicians of her time, but none of the treatments had any effect. She died in 1679 at the age of forty-seven. The Principles of the Most Ancient and Modern Philosophy The text itself was probably written in 1677 and shows the influence of Franciscus Mercurius van Helmont. The text was first published in Latin translation by van Helmont in Amsterdam in 1690 as Principia philosophiae antiquissimae et recentissimae. An English retranslation appeared in 1692. The Principles develops Conway's monistic view of the world as created from one substance. Conway is critical of the Cartesian idea that bodies are constituted of dead matter, of Henry More's concept of the soul in his Antidote Against Atheism, and of dualist theories of the relationship between the body and spirit. Bibliography The principles of the most ancient and modern philosophy (London: n. publ., 1692) 168 pp. in 12°. – originally printed in Latin: Principia philosophiae antiquissimae et recentissimae de Deo, Christo & Creatura, Amsterdam: M. Brown 1690. Letters. The Correspondence of Anne, Viscountess Conway, Henry More and their friends, 1642–1684, ed. M. H. Nicolson (London 1930) 517 pp. Collaborations with Franciscus Mercurius van Helmont (1614–1698) A Cabbalistical Dialogue (1682) (in Christian Knorr von Rosenroth, Kabbala denudata, 1677–1684) Two Hundred Quiries moderately propounded concerning the Doctrine of the Revolution of Humane Souls (1684). References Further reading Broad, Jacqueline. Women Philosophers of the Seventeenth Century. Cambridge Cambridge University Press, 2002. Brown, Stuart. "Leibniz and Henry More’s Cabbalistic Circle", in S. Hutton (ed.) Henry More (1614–1687): Tercentenary Studies, Dordrecht: Kluwer Academic Publishers, 1990.(Challenges the view that Conway influenced Leibniz.) Duran, Jane. "Anne Viscountess Conway: a Seventeenth-Century Rationalist". Hypatia: a Journal of Feminist Philosophy. 4 (1989): 64–79. Frankel, Lois. "Anne Finch, Viscountess Conway," Mary Ellen Waithe, ed., A History of Women Philosophers, Vol. 3, Kluwer, 1991, pp. 41–58. Gabbey, Alan. "Anne Conway et Henry More: lettres sur Descartes" (Archives de Philosophie 40, pp. 379–404)