This book is an attempt to sketch the history of three singularly interesting episodes in the literary relations between France and England, namely, the' visits of Voltaire, Montesquieu, and Rousseau, during periods extending respectively from the spring of 1726 to the spring of 1729, from the autumn of 1729 to the spring or early summer of 1731, andfrom January 1766 to May 1767. It is an attempt to supply what has not been supplied elsewhere, or indeed treated in any other way than occasionally and collaterally, by any previous writer, so far at least as I know.