Mr. Lincoln replied to Mr. C.,  and, with his usual ability, made the best of a bad position. We have never heard him when more at fault in covering up the heresies which he habitually takes to. The whole tenor of his discussion was to satisfy the whig portion of his audience that affiliation with abolitionism was the only salvation of their party, and (Heaven save the mark!) of the country! He knew nothing of the secret institution of which Mr. Calhoun spoke, and, like the Journal, even ``doubted its existence.'' Of course he did. He ``Knows Nothing'' about it.