In the course of the revolutionary convulsions in France, a great body of historical documents had been abstracted from the famous old Castle of Blois. Eventually, as years passed on, they found their way into the country-seat, at Pomard, of the Baron de JOURSANVAULT, and with them were amalgamated an extensive collection of old family papers, many books on genealogy, and some choice illuminated missals. An English gentleman long resident in France had formed the acquaintance of the Baron de JOURSANVAULT, and in the course of conversation came to hear of the existence of these historical treasures. He also perceived that their owner had little taste for them, or ability to profit by their contents. Sir Thomas Elmsley CROFT probed his French friend on the subject of parting with them. The Baron lent a willing ear, and, to whet his interlocutor’s appetite, told him that a great many of the manuscripts related to the history of the English rule in France. Sir Thomas then apprised an English friend, famous for his love of old MSS., of the existence of the hoards, and of the certainty that the Baron who owned them would greatly prefer a few rouleaux of English gold to a whole castle-full of the most precious parchments that ever charmed the longing eyes of a Jonathan OLDBUCK—or a Harris NICOLAS. Sir Harris, directly he received this piece of news from Paris, passed it on to his friend the late Lord CANTERBURY, then Speaker, who, in turn, communicated the information to Sir H. ELLIS, for the use of the Trustees. ELLIS was sent to France—whither indeed he had, just at that moment, arranged to go, in order to spend part of his holidays in Paris, according to his frequent custom. He reached Pomard (two hundred and fifty miles from Paris) in September, 1829, and found a vast body of charters which had formed the archives of the mediæval Earls of Blois, together with many heraldic and genealogical manuscripts chiefly relating to French families. But he found hardly any manuscripts which bore, directly, upon English history or affairs—the immediate object, it must be remembered, of the mission given him by the Trustees. [Sidenote: SIR HENRY ELLIS’S REPORT ON THE HISTORICAL MSS. AT POMARD.]