A spy on the conjurer : Or, A collection of surprizing and diverting stories, with merry and ingenious letters. By way of memoirs of the famous Mr. Duncan Campbell, demonstrating the astonishing foresight of that wonderful deaf and dumb man. The whole being moral and instructive. Written to my Lord -------- by a Lady, who, for twenty years past, has made it her business to observe all transactions in the life and conversation of Mr. Campbell. Revised by Mrs. Eliza Haywood.