-Thement of the United States has seven Ministers plenipotentiary abroad, every one of whom are from slave States,and doubtless slaveholders! They are Louis M'Lane, of Maryland at London. W. R. King, Alabama, at Paris. C. S. Todd, Kentucky, at Si. Petersburg. Hexry A. Wise, Virginia, at Rio Janeiro. John Slidell, Louisiana, at Mexico. Romulus M. Sauxders, North Carolina, al Madrid. Andrew J. Donelson, Tennessee, at Derlin. (t?3 We shall finish the Railroad Law next week. We insert it for the benefit of a large portion of our subscribers, who have no opportunity of seeing it in any other paper.