Dramatic Feuilleton Figaro reports to Mr. Editor that he went to see Charles Kean's Hamlet last Saturday and discusses Kean's performance and acting in general.  Figaro claims that it would be a good lesson for young actors and actresses to watch Kean perform, but fears they may get the wrong idea and start imitating his style.  Figaro reports that Frank Cahill, "Wild Humorist of the Marshes," will be giving a talk on "Frogs" at Niblo's next week.  Figaro also discusses the end of Ward's, "Wild Humorist of the Plains," engagement at Irving Hall.  He will be followed by Mr. Bateman and company.  Figaro gives an update on Maretzek, the opera, and the <cite>Herald</cite>.  Figaro also discusses Clarke's performance and warm reception at the Winter Garden.