The singular commotion which gave so melancholy a prestige of the reign of Nicholas, receives a very full explanation from this author. The Grand-duke Constantine had the countenance of a Calmuck and the manners of a Calmuck. But those were the countenance and manners of his father Paul. The other sons resembled their mother, the Princess of Wirtemberg, a woman of striking appearance and of commanding mind. Constantine was violent, passionate, and insulting; and in his viceroyalty of Poland rendered himself unpopular in the extreme. The result was, that Alexander dreaded to leave him as successor to the throne. Constantine, when scarcely beyond boyhood, had been married to one of the princesses of Saxe Cobourg, not yet fifteen. They soon quarrelled, and at the end of four years finally separated. In two years after, proposals were made to her to return. But she recollected too deeply the vexations of the past, and refused to leave Germany. Constantine now became enamoured of the daughter of a Polish count, and proposed to marry her. The Greek Church is stern on the subject of divorce, but its sternness can give way on due occasion. The consent of the emperor extinguished all its scruples, and Constantine divorced his princess, and married the Polish girl; yet, by that left-handed marriage, which precludes her from inheriting titles or estates. But the emperor shortly after conferred on her the title of Princess of Lowictz, from an estate which he gave her, and both which were capable of descending to her family. It was subsequently ascertained that, at this period, Alexander had proposed to Constantine the resignation of his right to the throne; either as the price of his consent to the divorce, or from the common conviction of both, that the succession would only bring evil on Constantine and the empire. That Alexander was perfectly disinterested, is only consonant to his manly nature, and that Constantine had come to a wise decision, is equally probable. He knew his own failings, the haste of his temper, his unpopularity, and the offence which he was in the habit of giving to all classes. He probably, also, had a sufficient dread of the fate of his father, whom, as he resembled in every thing else, he might also resemble in his death. His present position fulfilled all the wishes of a man who loved power without responsibility, and enjoyed occupation without relinquishing his ease. The transaction was complete, and Alexander was tranquillised for the fate of Russia.