Since the early nineteenth century it has been known that Frances Reynolds, the sister of Sir Joshua, was the author of an essay on taste, which she had printed but did not publish. Yet persistent search failed to turn up a single copy. It remained one of those lost pieces which every research scholar hoped someday to discover. In 1935 it appeared that the search was over. Among some manuscripts of Mrs. Thrale-Piozzi, long hidden in Wales, was found a printed copy of an anonymous _Enquiry Concerning the Principles of Taste, and of the Origin of Our Ideas of Beauty, which seemed to be the lost essay.