Mr Clay's letter to the editors of the National intelligencer. Raleigh, April 17th, 1844 -- Mr. Polk's letter. Columbia, Tenn., April 23[r]d, 1844 -- Mr. Benton's speech. Abstract of the speech of Mr. Benton, of Missouri, delivered in the Senate of the United States, May 16th to 20th, 1844, in secret session on the treaty for the annexation of Texas to the United States -- Extracts from Mr. Benton's speech in reply to Mr. McDuffie, in the Senate, June 15th, 1844 -- Mr. Van Buren's letter. Extracts from Mr. Van Buren's letter to Mr. Hamet, of Mississsippi. Lindenwold, April 20th, 1844