Just previous to his marriage with Mary Todd, Mr. Lincoln was challenged to fight a duel by James Shields, then Auditor of State. The challenge grew out of some humorous letters concerning Shields, published in a local paper. The first of these letters was written by Mr. Lincoln. The others by Mary Todd and her sister. Mr. Lincoln acknowledged the authorship of the letters without naming the ladies, and agreed to meet Shields on the field of honor. As he had the choice of weapons he named broadswords, and actually went to the place selected for the duel. The duel was never fought. Mutual friends got together and patched up an understanding between Mr. Lincoln and the hot-headed Irishman. FORMS NEW PARTNERSHIP. Before this time Mr. Lincoln had dissolved partnership with Stuart and entered into a law partnership with Judge Logan. In 1843 both Lincoln and Logan were candidates for nomination for Congress and the personal ill-will caused by their rivalry resulted in the dissolution of the firm and the formation of a new law firm of Lincoln & Herndon, which continued, nominally at least, until Mr. Lincoln’s death. The congressional nomination, however, went to Edward D. Baker, who was elected. Two years later the principal candidates for the Whig nomination for Congress were Mr. Lincoln and his former law partner, Judge Logan. Party sentiment was so strongly in favor of Lincoln that Judge Logan withdrew and Lincoln was nominated unanimously. The campaign that followed was one of the most memorable and interesting ever held in Illinois. DEFEATS PETER CARTWRIGHT FOR CONGRESS. Mr. Lincoln’s opponent on the Democratic ticket was no less a person than old Peter Cartwright, the famous Methodist preacher and circuit rider. Cartwright had preached to almost every congregation in the district and had a strong following in all the churches. Mr. Lincoln did not underestimate the strength of his great rival. He abandoned his law business entirely and gave his whole attention to the canvass. This time Mr. Lincoln was victorious and was elected by a large majority. When Lincoln took his seat in Congress, in 1847, he was the only Whig member from Illinois. His great political rival, Douglas, was in the Senate. The Mexican War had already broken out, which, in common with his party, he had opposed. Later in life he was charged with having opposed the voting of supplies to the American troops in Mexico, but this was a falsehood which he easily disproved. He was strongly opposed to the War, but after it was once begun he urged its vigorous prosecution and voted with the Democrats on all measures concerning the care and pay of the soldiers. His opposition to the War, however, cost him a re-election; it cost his party the congressional district, which was carried by the Democrats in 1848. Lincoln’s former law partner, Judge Logan, secured the Whig nomination that year and was defeated. MAKES SPEECHES FOR “OLD ZACH.”