In the year 1828, the Crown Prince of Prussia, (now King Frederic William,) while passing through Bologna, on his way to Rome, sought an interview with Mezzofanti. In common with all other visitors, he was struck with wonder at the marvellous variety and accuracy of his knowledge of languages. On his arrival at Rome, he spoke admiringly of this interview to Dr. Tholuck, the present distinguished professor of Theology at Halle, (at that time chaplain of the Prussian Embassy in Rome,) who has kindly communicated the particulars to me. “The prince urged me,” says Dr. Tholuck, in an exceedingly interesting letter which shall be inserted later, “not to leave Italy without having seen him. ‘He is truly a miracle,’ exclaimed the prince; ‘he spoke German with me, like a German; with my Privy-Councillor Ancillon, he spoke the purest French; with Bunsen, English; with General Gröben, Swedish.’ ‘And what is still more wonderful,’ subjoined M. Bunsen, then minister resident in Rome, ‘all these languages he has learnt by books alone, without any teacher.’” This opinion of M. Bunsen’s, Dr. Tholuck afterwards ascertained to be a mistake, or at least an exaggeration. It was doubtless to the lessons of his early master, Father Thiulen, that he owed the knowledge of Swedish which enabled him to converse with General Gröben. A still more distinct evidence of his familiarity with it occurred on occasion of the visit of the Crown Prince (now King) Oscar of Sweden to Bologna. M. Braunerhjelm, now Hof-Stallmastäre at Stockholm, who was present at the prince’s interview with Mezzofanti, assured Mr. Wackerbarth, who was good enough to make the inquiry for me last year, that “the abate spoke the language quite perfectly.” According to another account which I have received, the prince, having suddenly changed the conversation into a dialect peculiar to one of the provinces of Sweden, Mezzofanti was obliged to confess his inability to understand him. What was his amazement, in a subsequent interview, to hear Mezzofanti address him in this very dialect! “From whom, in the name of all that is wonderful, have you learnt it?” exclaimed the prince. “From your Royal Highness,” replied Mezzofanti. “Your conversation yesterday supplied me with a key to all that is peculiar in its forms, and I am merely translating the common words into this form.”