Theatre. Mr. & Misses Wallack's Benefit. On Thursday evening, Septem. 11, will be presented (first time this season,) a dramatic romanace, called "The Lady of the Lake" ... In the course of the evening Imitations by Mr. Wallack of Mr. Keene in the character of Shylock, Mr. Booth, Sir Edard Mortimer, Mr. Kemble, Rolla, Mr. Matthews, Goldfinch, and as Monsieur Morleu, in the favorite farce of Monsieur Tonson. A hornpipe, by Mrs. Wallack. After which, (by particular desire) first time this season, the favourite musical drama of "The Libertine" ...