The El Dorado of the Pacific, was got up under the auspices of Mr. Ewing, through his correspondence from Washington, after his arrival there in December. And it is said that he imparted facts in respect to the quantity of gold to be found, and the ease of obtaining it, made known to him confidentially by his friends in the employ of the government; and that, while Mr. Ewing urged the formation and the speedy departure of a limited company, he enjoined secrecy in regard to the facts alluded to. Hence the company was made up in a kind of private manner. In fact, it is pretty much of a family concern. For, besides a son of Mr. Ewing, six others of the twenty are relations. And I find it common talk here, that this company will have special advantages, through Mr. Ewing, as a member of the incoming cabinet, which, he is reported to have assured his friends here, he was certain of obtaining at the hands of President Taylor. It is now said that Mr. Schenck is a competitor with Mr. Ewing for Ohio's place (if any) in the Cabinet, and that, though General Taylor had a high esteem for Mr. Ewing, yet, from a settled plan of organization of the new administration, in which Mr. Clay is understood to coincide, if he is not the originator, it will be incompatible to give Mr. Ewing a cabinet appointment; and that so soon as this is fully ascertained, Mr. Ewing will throw his influence in favor of Mr. Vinton. The "plan of organization" alluded to, is said to be to the effect that the "master-spirits" of the abortive administration of '41, shall all "stand off" and take no part (apparently,) in re-oiling the wheels of government, but leave this to be done by an entirely new set of public servants whose services can only be judged by the fruits of the future; and after these get the government car in good trim, and the "bulgme" well steamed, with a faithful (party) sentinel at every post requiring attention for safe traveling, the old laborers are to be taken on board and carried along to the end of the journey. That is, new men are to be placed at the heads of the departments at home, to take care of and to manage "men, measures, and principles," and the old political tinkers, now part and parcel of the incoming administration party, are to be made ministers, envoys, consuls, and charges abroad, and governors, judges, &c., at home. Such being the understanding here among the friends of Mr. Ewing, who have his personal welfare and political advancement too much at heart to remain indifferent in the present state of affairs at Washington, where he now is, not to make it and all they know in regard to it a common social and public talk, they are all free in saying that if he fails of being taken into the cabinet he will next seek the highest appointment over affairs in California.