ARRIVAL OF THE RUSSIAN AMBASSADRESS AND THE SPORTING COUNT !-This
event, which we alluded to in our last Postscript as a thing expected, but at the same time a mystery, has actually come to pass. It is generally understood, that the Princess's mission to St. Petersburg was expressly to contradict or change certain impressions which Lord DURHAM'S mission had made, more particularly as to the feelings in this country in regard to Poland, and the state of parties in the Houses of Parliament. Count MASTUCHEWITZ, of protocol notoriety, has got the permission of the Emperor to return to this country, not on any " special mission," but in his sporting character, to feel the pulse of certain classes of society, for which no man is better qualified. The Count is a most successful bettor in " the ring," and at Crockford's ; so much so, that he is reported to have cleared more money at play last year than sufficed to defray the expenses of the Imperial mission.