Margaret Morton, whose previous books include T"he Tunnel "and "Transitory Gardens," is Professor of Art at the Cooper Union for the Advancement of Science and Art in New York City. Alan Trachtenberg, Neil Grey Professor of English and American Studies at Yale University, is the author of, among other books," Reading American Photographs: Image as History "and "From Mathew Brady to Walker Evans" (Hill & Wang). He writes and lectures often on American literature, photography, and cultural history.