The directors of the Concord Public Library have joined in the general scheme to advertise MARK TWAIN'S new book "Huckleberry Finn". They have placed it on the Index Expurgatorius, and this will compel every citizen of Concord to read the book in order to see why the guardians of his morals prohibited it. Concord keeps up its recent reputation of being the home of speculative philosophy and of practical nonsense.