An attempt at discussion, which you will find at the end of the new edition of "Menagiana," which has just been published in this country, affords me the opportunity of giving some information to the public on a subject which appears to call into exercise the ingenuity of almost all the learned; and at the same time of vindicating the character of many eminent men, and men of distinguished merit, who have been attacked as the authors of the work which forms the subject of a disquisition attributed to M. de la Monnoye. Without doubt this new book is already in your possession; you will perceive that I allude to "The Three Impostors." The author of the dissertation upholds the non-existence of such a book, and attempts to establish his point by bringing forward conjectures, without advancing any evidence capable in the smallest degree of influencing the opinions of those who are accustomed to examine before they decide. I will not undertake to refute seriatim the articles contained in a dissertation, the substance of which is to be found in a Latin discourse by M. Burkhard Gotthelf Struve, on "Learned Impostors," printed for the second time at Geneva, by Muller in 1706, and which M. de la Monnoye must have seen, because he quotes from it. He will acknowledge that I am quite prepared to overturn his arguments, when I inform him that I have read this celebrated little work, and that I have it in my library. I will give you and the public an account of the way in which I discovered it, and as it is in my possession, I will subjoin a short but faithful description of it.