The Eighth Lecture of the Course before the Anti-Slavery Society, was delivered, January 14, 1855, at the Tabernacle, New York, by the Rev. Henry Ward Beecher. The subject, at the present time, is one of peculiar interest, as touching the questions of Slavery and Know-Nothingism, and, together with the popularity of the lecturer, drew together a house-full of auditors.