This book is the record of a remarkable friendship between the Cambridge Platonist Henry More and one of the foremost women intellectuals of the seventeenth century, Lady Anne Conway. The letters cover a wide range of topics--personal, philosophical, religious, and social, and they give a detailed picture of the More-Conway circle which included such figures as Jeremy Taylor, Ralph Cudworth, Robert Boyle, and William Penn. This revised edition reprints all the letters from the original 1930 edition, together with Marjorie Nicolson's biographical account of Anne Conway and Henry More, with its emphasis on the personal side of their relationship. A new appendix contains important letters not included in the first edition, among them the early discussion of Cartesianism. The introduction by Sarah Hutton sets the book in the context of recent scholarship.