These gentlemen will allow me to observe, that if they had read with attention my printed Memoir, and the report made by my esteemed colleague, M. Ginguené, of the labours of the Ancient History and Literature Class, since the 1st of July, 1808, they would have found that there was no conjecture in it at all on my part. In fact, it was in quoting different passages of Arabic authors, relating to the enterprises undertaken at different periods by the Syrian Ismailites against Saladin, that I proved to demonstration, that those writers employed indifferently, in the same work, the names _Ismailites_, _Batenites_, and _Haschischin_ (_Hashishin_), as synonymous; and that the chief of this horde of ruffians, was called the Possessor of the _Haschischa_ (_Hashisha_). I even took occasion to observe, that the Byzantine writers called the Assassins _Chasisioi_; and that the Jew, Benjamin of Tudela, names them in Hebrew, _Haschischin_ (_Hashishin_). These facts being incontestable, I had to inquire what was this _Haschisch_ or _Haschischa_ (_Hashish_ or _Hashisha_), possessed by the chief of the Ismailites, from which these latter derived their name of _Haschischin_ (_Hashishin_); and, certainly, it needed no great stretch of imagination, to discover the _haschiseha_ of the Ismailites in that of the Syrians and Egyptians of the present day. I afterwards showed, by very positive historical testimony, that, at the period when the Assassins signalized themselves by their atrocities and murders, the use of intoxicating preparations made with hemp had not yet been introduced among the Musulmans; lastly, I proved by a host of facts, and the testimony of Marco Polo, that the _hashish_ was not used among the Ismailites for the purpose of throwing those to whom it was administered, into a state of madness and frenzy, during the continuance of which they performed the most barbarous actions, almost consciously; but, that it was a secret known only to the chief of the sect, and which he employed, to deprive for a time of the use of their reason, those young men, whom he wished, by means of every kind of seduction, which could inflame the imagination and exalt the sense, to inspire with blind obedience to his behests.