Volume X, Lectures and Biographical Sketches, collects some of the most interesting examples of Emerson's thought. His lecture on "Demonology," for example, warns against what he calls the "low curiosity" of the paranormal. "Education" is of great interest to teachers and the lecture has been used often by reformers in the field. The address entitled "Thoreau" was delivered at the funeral of Henry David Thoreau in May, 1862, and is the finest reminiscence we have of Emerson's great friend.