Your friend Duval dined with me the other day, and complained most grievously that he had not heard from you above a year; I bid him abuse you for it himself; and advised him to do it in verse, which, if he was really angry, his indignation would enable him to do. He accordingly brought me, yesterday, the inclosed reproaches and challenge, which he desired me to transmit to you. As this is his first essay in English poetry, the inaccuracies in the rhymes and the numbers are very excusable. He insists, as you will find, upon being answered in verse; which I should imagine that you and Mr. HARTE, together, could bring about; as the late Lady Dorchester used to say, that she and Dr. Radcliffe, together, could cure a fever. This is however sure, that it now rests upon you; and no man can say what methods Duval may take, if you decline his challenge. I am sensible that you are under some disadvantages in this proffered combat. Your climate, at this time of the year especially, delights more in the wood fire, than in the poetic fire; and I conceive the Muses, if there are any at Leipsig, to be rather shivering than singing; nay, I question whether Apollo is even known there as god of Verse, or as god of Light: perhaps a little as god of Physic. These will be fair excuses, if your performance should fall something short; though I do not apprehend that it will. While you have been at Leipsig, which is a place of study more than of pleasure or company, you have had all opportunities of pursuing your studies uninterruptedly; and have had, I believe, very few temptations to the contrary. But the case will be quite different at Berlin, where the splendor and dissipation of a court and the 'beau monde', will present themselves to you in gaudy shapes, attractive enough to all young people. Do not think, now, that like an old fellow, I am going to advise you to reject them, and shut yourself up in your closet: quite the contrary; I advise you to take your share, and enter into them with spirit and pleasure; but then I advise you, too, to allot your time so prudently, as that learning may keep pace with pleasures; there is full time, in the course of the day, for both, if you do but manage that time right and like a good economist. The whole morning, if diligently and attentively devoted to solid studies, will go a great way at the year's end; and the evenings spent in the pleasures of good company, will go as far in teaching you a knowledge, not much less necessary than the other, I mean the knowledge of the world. Between these two necessary studies, that of books in the morning, and that of the world in the evening, you see that you will not have one minute to squander or slattern away. Nobody ever lent themselves more than I did, when I was young, to the pleasures and dissipation of good company. I even did it too much. But then, I can assure you, that I always found time for serious studies; and, when I