BARON HUMBOLDT --A private letter from Baron Humboldt to a friend in New York, concludes as follows: I still work hard, mostly in the night, because I am unmercifully tormented with a constantly increasing correspondence, for the most part, of not the slightest interest. I live joyless in my 89th year, because of the much for which I have ardently striven from my early youth, so little has been accomplished. With renewed expressions of the friendship of many years, which political events have never troubled, I am ever your illegible, Berlin, January 11, '58. AL HUMBOLDT.