Chronically impoverished, tormented by self-doubt and a crippling addiction to opium, Samuel Taylor Coleridge (1772-1834) still managed to become one of the most versatile and influential forces of English romanticism. The Portable Coleridge faithfully represents all facets of this complex, haunted genius, including his poems, "The Rime of the Ancient Mariner," "Christabel," "Kubla Khan," and "Dejection"; letters...