It now appears that when Mr. Slidell, in company with Mr. James M. Mason, of Virginia, departed for Europe, he ' took with him his wife and intcresting ' son and daughters. Shrowd men iu this quarter, who know the wily Louisiana '■ Senator, predict that it is his intention never to return; so that, so far from oaring about the interests of the Confederacy, he is ouly too glad to be rid of it; and that, if a reverse should happen to Davis & Co., he will quietly settle down and cultívate his foreign tastes, leaving his friends at home to take care of themselves. It is also stated that during his stay in Richmond he became exceedingly unpopular, by his haughty and dictatorial marnier, and particulariy by his malignant persocution of the Northern prisoners. He never was liked in Louisiana, and thousands of Union men who have been compelled to espouse secession, blame him for driving them into the conspiracy. The firo in the rear - of which tho fiery Frenchuian, Pierre Soule, is the author - is a conñagration that he is not prepared to meet. Slidell is a very old man fond of his ease - and bas, doubtless, prepared for the storm, which, with his peculiar relations to the leading money men of Europo, he could easily do, by clandestinely disposing of iuffieient proporty to enable him to apend the balance of his days in a land to whieh all his sympathies have been tending. It i stated that a widow of his own brother, the celebrated Slidell Mackenzie, now residing at Morristowu, New Jersey, has stricken the Slidell out of her name, and now calis herself simply Mrs. Mackcuzie.