The curtain of the political theatre was partly drawn up the day before yesterday, and exhibited a scene which the public in general did not expect; the Duke of Newcastle was declared First Lord Commissioner of the Treasury, Mr. Fox Secretary of State in his room, and Mr. Henry Legge Chancellor of the Exchequer:  The employments of Treasurer of the Navy, and Secretary at War, supposed to be vacant by the promotion of Mr. Fox and Mr. Legge, were to be kept ‘in petto’ till the dissolution of this parliament, which will probably be next week, to avoid the expense and trouble of unnecessary re-elections; but it was generally supposed that Colonel Yorke, of The Hague, was to succeed Mr. Fox; and George Greenville, Mr. Legge.  This scheme, had it taken place, you are, I believe aware, was more a temporary expedient, for securing the elections of the new parliament, and forming it, at its first meeting, to the interests and the inclinations of the Duke of Newcastle and the Chancellor, than a plan of administration either intended or wished to be permanent.  This scheme was disturbed yesterday:  Mr. Fox, who had sullenly accepted the seals the day before, more sullenly refused them yesterday.  His object was to be First Commissioner of the Treasury, and Chancellor of the Exchequer, and consequently to have a share in the election of the new parliament, and a much greater in the management of it when chosen.  This necessary consequence of his view defeated it; and the Duke of Newcastle and the Chancellor chose to kick him upstairs into the Secretaryship of State, rather than trust him with either the election or the management of the new parliament.  In this, considering their respective situations, they certainly acted wisely; but whether Mr. Fox has done so, or not, in refusing the seals, is a point which I cannot determine.  If he is, as I presume he is, animated with revenge, and I believe would not be over scrupulous in the means of gratifying it, I should have thought he could have done it better, as Secretary of State, with constant admission into the closet, than as a private man at the head of an opposition.  But I see all these things at too great a distance to be able to judge soundly of them.  The true springs and motives of political measures are confined within a very narrow circle, and known to a very few; the good reasons alleged are seldom the true ones:  The public commonly judges, or rather guesses, wrong, and I am now one of that public.  I therefore recommend to you a prudent Pyrrhonism in all matters of state, until you become one of the wheels of them yourself, and consequently acquainted with the general motion, at least, of the others; for as to all the minute and secret springs, that contribute more or less to the whole machine, no man living ever knows them all, not even he who has the principal direction of it.  As in the human body, there are innumerable little vessels and glands that have a good deal to do, and yet escape the knowledge of the most skillful