Naval.—The L. S. sloop of war St Louis, French Forrest Commander, arrived at Norfolk on the 16th inst , and fired a salute to the commodore, whichwas returned by the Pennsylvania flag-ehip.Captain John H. Aulic, (late of the sloopr f war Yorktown) bavins been promoted, has returned home in the St. Louis leaving the Yorktown in command of Cornm’r John S. Nicholas.Lieut. Henry Eagle, Jr., commands the schooner Shark, in place of Comm’r T. A. Dornin, promoted, and in command of the sloop of war Dale.Lieut. Sterrett who went out aa first Lieut, of the United States, commands the store ship Relief, ard Lieut. Lardner, first of the Cyane, has tuken the place of Lieut. S. on board the United StatesThe squadron would leave Callao on the arrival of the sloop of war Dale, Comm’r Dornin, and proceed down to Coquimbo. The Cyane would from thence be detached on a cruize among the Marquesas, the Society and Sandwich Islands, and then in the Gulf of California.'The St Louis left Rio Janeiro August 5. at which time the IT. S ship Delaware, 74, Commodore Morris, with the sloop of war Decatur, were at ihe river of Plate, to return to Rio about the 1st pf September. The John Adams, Capt. Conover, was at Rio Janeiro, to sail in about ten days for Mozambique, East coast of Africa.Extract of a letter to the editor of the Herald, dated Callao Ray, May 29:—“The United States arrived here on the 13th mst. from Valparaiso, having touched there on the 5th, and sailed on the 6th for thia port. The squadron are all here with the exception of the Dale, which ship ia expected every hour, and then we shall nut to pea The following vessels are in this port: frigate United States, Com.Thos Ap C. Jones; sloop of war Cyane, Comm’rC. K. Stnbling ; Yorktown, Comm’r Nicholas; schooner Shark, Lt. Com’dt Eagle, and store ship Relief The officers and crews of all the vewels enjoy uninterrupted good health. Not an accident to any individual on board has occurred since we left Norfolk. The United States is a first rate sailer, she makes nothing of going her two hundred and odd miles in twenty-four hours. Our passage round Cape Horn was not as had as was expected, although it was bad enough. We had snow, hail, wind and rain, as much as we could lay under for about ten days, when we weathered the Horn. Our passage from Rio to Valparaiso was forty days, during which we did not see any American man of war until we came to anchor here at Callao, where we found tha St. Louis, Cyane, Shark and Relief. They never have any rain here, and it is well for them that ihey do not, as it would wash their houses, which are built of small reeds and mud, into the middle of next year Ships of the largest class might ride herein safety with a small hawser instead of a caMe, the wind is ao light. There are now here British, French, American, Chilian and Peruvian frigates and othervessels of war, and about thirty merchant vessels.