SIR:--In reply to your proposal to attempt a negotiation with Mlle. Jenny Lind to visit the United States professionally, I propose to enter into an arrangement with her to the following effect: I will engage to pay all her expenses from Europe, provide for and pay for one principal tenor and one pianist, their salaries not exceeding together one hundred and fifty dollars per night; to support for her a carriage, two servants, and a friend to accompany her and superintend her finances. I will furthermore pay all and every expense appertaining to her appearance before the public, and give her half of the gross receipts arising from concerts or operas. I will engage to travel with her personally and attend to the arrangements, provided she will undertake to give not less than eighty nor more than one hundred and fifty concerts, or nights’ performances. PHINEAS T. BARNUM. I certify the above to be a true extract from the letter. J. H. WILTON. I was at my Museum in Philadelphia when Wilton arrived in New York, February 19, 1850. He immediately telegraphed to me, in the cipher we had agreed upon, that he had signed an engagement with Jenny Lind, by which she was to commence her concerts in America in the following September. I was somewhat startled by this sudden announcement; and feeling that the time to elapse before her arrival was so long that it would be policy to keep the engagement private for a few months, I immediately telegraphed him not to mention it to any person, and that I would meet him the next day in New York. When we reflect how thoroughly Jenny Lind, her musical powers, her character, and wonderful successes, were subsequently known by all classes in this country as well as throughout the civilized world, it is difficult to realize that, at the time this engagement was made, she was comparatively unknown on this side the water. We can hardly credit the fact, that millions of persons in America had never heard of her, that other millions had merely read her name, but had no distinct idea of who or what she was. Only a small portion of the public were really aware of her great musical triumphs in the Old World, and this portion was confined almost entirely to musical people, travellers who had visited the Old World, and the conductors of the press. The next morning I started for New York. On arriving at Princeton we met the New York cars, and purchasing the morning papers, I was surprised to find in them a full account of my engagement with Jenny Lind. However, this premature announcement could not be recalled, and I put the best face on the matter. Anxious to learn how this communication would strike the public mind, I informed the conductor, whom I well knew, that I had made an engagement with Jenny Lind, and that she would surely visit this country in the following August. “Jenny Lind! Is she a dancer?” asked the conductor.