MISS PELICAN.--As this lady is about to leave us to commence an engagement on the San Francisco stage, we should regret exceedingly if anything we have said about her should send with her a _prestige_ which might be found undeserved on trial. The fact is, Miss Pelican is a very ordinary actress; indeed, one of the most indifferent ones we have ever happened to see. She came here from the Museum at Fort Laramie, and we praised her so injudiciously that she became completely spoiled. She has performed a round of characters during the last week, very miserably, though we are bound to confess that her performance of King Lear last evening was superior to anything of the kind we ever saw. Miss Pelican is about forty-three years of age, singularly plain in her personal appearance, awkward and embarrassed, with a cracked and squeaking voice, and really dresses quite outrageously. _She has much to learn--poor thing!_ I take it the above notices are rather ingenious. The fact is, I'm no judge of acting, and don't know how Miss Pelican will turn out. If well, why there's my notice of June the 1st; if ill, then June 31st comes in play, and, as there is but one copy of the Sentinel printed, it's an easy matter to destroy the incorrect one; _both can't be wrong_; so I've made a sure thing of it in any event. Here follows my musical critique, which I flatter myself is of rather superior order: THE PLAINS. ODE SYMPHONIE PAR JABEZ TARBOX.--This glorious composition was produced at the San Diego Odeon on the 31st of June, ult., for the first time in this or any other country, by a very full orchestra (the performance taking place immediately after supper), and a chorus composed of the entire "Sauer Kraut-Verein," the "Wee Gates Association," and choice selections from the "Gyascutus" and "Pike-harmonic" societies. The solos were rendered by Herr Tuden Links, the recitations by Herr Von Hyden Schnapps, both performers being assisted by Messrs. John Smith and Joseph Brown, who held their coats, fanned them, and furnished water during the more overpowering passages. "The Plains" we consider the greatest musical achievement that has been presented to an enraptured public. Like Waterloo among battles; Napoleon among warriors; Niagara among falls, and Peck among senators, this magnificent composition stands among Oratorios, Operas, Musical Melodramas and performances of Ethiopian Serenaders, peerless and unrivaled. _Il frappe toute chose parfaitement froid._