"3d. That he refused to commit himself fully on the great question as to the power of Congress over the Territories of the United States, and as far as he did go, evidently left it to be understood that the abolition of slavery by Congress in those Territories would be no attack on the States in which it exists.'

"If his opinions, in these respects, have undergone any material change, the country has not yet been authoritatively apprised of the fact. The reflections cast by him on the institution of slavery, in one of his speeches in England, and the studied design he has manifested to keep aloof from the excitement growing out of the repeal of the Missouri Compromise, are not well calculated to inspire confidence, that if his views have undergone any change, it has been a change for the better."

After thus disposing of the slavery issue, Mr. Irving thus turns to the Tariff Question:

"So much for the slavery issue. How does Mr. Buchanan stand upon the tariff? Will the Sentinel say that he is sound, or justify his 'low wages' speech? How does he stand upon the French Spoliation bill, which President Polk and President Pierce vetoed? Everybody knows that he was in favor of it. How does he stand upon the Pacific Railroad? He declared himself in favor of an appropriation of public money to build it, as is notorious. In fact, is there a single Federal measure except that of the United States Bank, upon which he is not recorded against Democratic principles? How can we hope to carry the united South with such a record? Will Southern Democrats overlook this record? Will Northern Nebraska men overlook this ignoring of Pierce and Douglass? Is there no danger that in admitting the abolitionist Trumbull, we may not dishearten the gallant Douglass? Is there no fear that in reinstating the free-soil Hickman, who is in favor of Reeder, we may not palsy the arm of Richardson? In fine, is there no fear that in hoping for free-soil aid, we may not lose the few real friends the South has in the North? It is evident to the commonest understanding, that the first step of Northern Black Republicanism is to kill off all those influential men at the North, like Pierce or Douglass, who have actively participated in the fight for our rights. Is not the South aiding them in this first step, when it not only ignores its own sons, but also ignores, upon the ground of availability, those Northern men identified with the late Kansas-Nebraska bill? This is a question the South would do well to ponder. If Mr. Buchanan is to be nominated, and Pierce and Douglass in the North ignored, let the responsibility rest elsewhere than upon the State of Virginia. He may be, and probably is sound, but these are times when more than ordinary caution is necessary. It may become the duty of the South to support him. When that time arrives I can discharge the duty; but I do think that the reasons above stated exempt me from any blame for not advocating him until that responsibility devolves upon me. Very respectfully, Chas. Irving.

The Southern Dough-faces of the Foreign Catholic party pretend to hold Mr. Fillmore responsible for a letter he wrote more than twenty years ago, in which he answers certain interrogatories in reference to slavery, affirmatively, and in opposition to the extension of slavery! The latest record of Buchanan is in 1844, and proves him to be an ABOLITIONIST OF THE BLACKEST DYE. About the last speech he ever made in Congress, was IN OPPOSITION TO SLAVERY, in secret session of the Senate, just before Mr. Polk, in opposition to the wishes of Gen. Jackson, gave him a seat in his cabinet. This speech will be found in the Congressional Globe for 1844, an extract from which is in these explicit and memorable words:

"In arriving at the conclusion to support this treaty, I had to encounter but one serious obstacle, and that was the question of slavery. Whilst I have ever maintained, and ever shall maintain, in their full force and vigor, the constitutional rights of the Southern States over their slave property, I yet feel a strong repugnance by any act of mine to extend the limits of the Union over a new slaveholding territory. After mature reflection, however, I overcame these scruples, and now believe that the acquisition of Texas will be the means of limiting, not enlarging, the dominion of slavery.

"In the government of the world, Providence generally produces great changes by gradual means. There is nothing rash in the counsels of the Almighty. May not, then, the acquisition of Texas be the means of gradually drawing the slaves far to the South to a climate more congenial to their nature; and may they not finally pass off into Mexico, and there mingle with a race where no prejudice exists against their color? The Mexican nation is composed of Spaniards, Indians, and Negroes, blended together in every variety, who would receive our slaves on terms of perfect social equality. To this condition they never can be admitted in the United States.

"That the acquisition of Texas would ere long convert Maryland, Virginia, Kentucky, Missouri, and probably others of the more Northern Slave States, into free States, I entertain not a doubt....

"But should Texas be annexed to the Union, causes will be brought into operation which must inevitably remove slavery from what may be called the farming States. From the best information, it is no longer profitable to raise wheat, rye, and corn, by slave labor. Where these articles are the only staples of agriculture, in the pointed and expressive language of Randolph, if the slave does not run away from his master, the master must run away from the slave. The slave will naturally be removed from such a country, where his labor is scarcely adequate to his own support, to a region where he can not only maintain himself, but yield large profits to his master. Texas will open an outlet; and slavery itself may thus finally pass the Del Norte, and be lost in Mexico. One thing is certain, the present number of slaves cannot be increased by the annexation of Texas.

"I have never apprehended the preponderance of the slave States in the councils of the nation. Such a fear has always appeared to me visionary. But those who entertain such apprehensions need not be alarmed by the acquisition of Texas. More than one-half of its territory is wholly unfit for the slave labor; and, therefore, in the nature of things must be free. Mr. Clay, in his letter of the 17th of April last, on the subject of annexation, states that, according to his information—