July 12th.—There are rumours that the Federals, under Brigadier M’Clellan, who have advanced into Western Virginia, have gained some successes; but so far it seems to have no larger dimensions than the onward raid of one clan against another in the Highlands. And whence do rumours come? From Government departments, which, like so many Danaes in the clerks’ rooms, receive the visits of the auriferous Jupiters of the press, who condense themselves into purveyors of smashes, slings, baskets of champagne, and dinners. M’Clellan is, however, considered a very steady and respectable professional soldier. A friend of his told me to-day one of the most serious complaints the Central Illinois Company had against him was that, during the Italian war, he seemed to forget their business; and that he was busied with maps stretched out on the floor, whereupon he, superincumbent, penned out the points of battle and strategy when he ought to have been attending to passenger trains and traffic. That which was flat blasphemy in a railway office may be amazingly approved in the field.