...of the most remarkable persons, of his age, I have ever known. He proposes to stay in Europe two or three years more; to visit Germany, France, and perhaps Spain, as well as England, Scotland, and Ireland . I leave Berlin in a few days for Heidelberg, whence I shall go down the Rhine to Cologne, then to Brussels, Antwerp, London. If I can do aught for you at home, you will let me know. Can I se...