And now, after the almost unanimous passage of the supplemental act in 1838, the sanction of the Legislature in 1839 and 1841, the decision of the Circuit Court and Chancellor, and of the High Court of Errors and Appeals, how strange is the assertion of Mr. Slidell, that 'The Union Bank bonds were issued in direct violation of an express constitutional provision.' It is a well settled principle of American law, so adjudicated by the State Courts, as well as by the Supreme Court of the United States, that, 1st, To authorize the court to decide that a law is unconstitutional, the repugnance to the Constitution must be '_plain and palpable_.' 2d., That the interpretation given by the _highest court of a State_, to a State law, or constitution, '_is conclusive_.' But the truth is, as is proved by Mr. Slidell's own letter (having never resided in the State), he knew nothing of the subject, or he never would have spoken of Jefferson Davis as 'Governor,' or alluded to 'his administration,' when he never held that office. But it is of some moment, at least to the unfortunate bondholders, that the minister of Jefferson Davis at Paris, _avers now_ that these bonds are _unconstitutional_. But, Mr. Slidell says, 'There is a wide difference between these bonds and those of the Planters' Bank, for the repudiation of which, neither excuse nor palliation can be offered.' Now, in a subsequent letter, I will prove conclusively, from authentic documents, that the State of Mississippi has, _most effectually_, repudiated those bonds also, and that Jefferson Davis has sustained that repudiation. In the case, also, of another slaveholding State, I will prove, from the public documents, that Jefferson Davis volunteered to sustain her in the repudiation of her State bonds, in a case more atrocious, if possible, than that of Mississippi. As Jefferson Davis is now at the head of a slaveholding conspiracy, endeavoring to destroy the Government of my country, and is now also engaged in selling worthless Confederate bonds in this market, I have deemed it my duty to make this publication. R. J. WALKER. NOTE.--Since this was written, the supposed menacing message from the Continent has been officially contradicted. Surely, however, I had a right to conclude, after such solemn assurances from a member to the House, that, although acting in the character of a Confederate messenger, and avowing such atrocious sentiments, he at least spoke the truth on that point. R. J. W. EVERGREEN BEAUTY.