Biswamoy Pati is Reader in the Department of History at Sri Venkateswara College, Delhi University, India. His research interests focus on colonial Indian social history and recent publications include an edited book, The Nature of 1857 (2007), and a book co-edited with Waltraud Ernst entitled India’s Princely States: People, Princes and Colonialism (2007).Mark Harrison is Professor of the History of Medicine and Director of the Wellcome Unit for the History of Medicine at Oxford University. His publications include Public Health in British India (1994), Climates and Constitutions (1999) and a co-edited book with Biswamoy Pati, Health, Medicine and Empire (2001).