* The British mapping of India provided some irrefutable evidence of the power of maps, not least to conceal as much as they reveal. A map of Calcutta, for example, produced in 1842 for the ominously named Society for the Diffusion of Useful Knowledge, showed public buildings such as banks and police stations, but no mention of temples or mosques. As Ian J. Barrow has pointed out in his history of mapping in India, ‘apart from the depiction of Indians as porters or peasants, there is little indication in the maps that Calcutta was an Indian city inhabited by Indians.’