In the months after the first edition of "Leaves of Grass", people became more upset about the sexual themes. Because of this, the publisher almost did not release the second edition. In 1856, 20 new poems were added. Different versions of "Leaves of Grass" continued to be published throughout the rest of Whitman's life. Many famous writers like Amos Bronson Alcott and Henry David Thoreau liked the work enough to visit Whitman.