Alfred W. Crosby is Professor Emeritus in American Studies, History, and Geography at the University of Texas, Austin, where he taught for more than 20 years. His previous books include Ecological Imperialism (2nd edition, Cambridge University Press, 2004), America's Forgotten Pandemic: The Influence of 1918 (2nd edition, Cambridge University Press, 2003), and The Measure of Reality: Quantification and Western Society, 1250-1600 (Cambridge University Press, 1997). The Measure of Reality was chosen by the Los Angeles Times as one of the 100 most important books of 1997.