The Conspiracy*As has been often remarked, aay9 the Richmond Whig, the secessionists of South Carolina have now furnished abundant evidence that they have been long conspiring the dissolution of the Union. The following are extracts speeches made in the South Carolina Convention, viz:Mr. Packer, speaking of secession, said: “It is no spasmodic effort that has come suddenly upon us, but it; has been gradually culminating for a long series of years.'1Mr. Ingles said: “ Most of us have had this subject under consideration for the last twenty years.”Mr. Keitt said : “ I have been engaged in this movement 6ver since I entered political life.Mr. Rhett said: “It is nothing produced by Mr. Lincoln’s election, or the non-execution of the fugitive slave law. It is a matter which has been gathering head for thirty years.” And he further said: “We are about to sunder our relations with that section [the North], and I trust for ever.On another occasion. Mr. Rhett said: “The Federal laws laying taxes on the people of South Carolina have fallen this day; and, so far as we are concerned, fallen, I trust, forever.Hence it appears that there has been a long concocted conspiracy to overturn the Government of the United States, and that the causes hitherto alleged are mere pretexts.