In the last few years, a new word has gained popularity among historians: ‘pre-industrial’. Specialists in the social and economic history of Europe before 1800 have become increasingly aware that the object of their studies is simply one case among others of what sociologists call ‘traditional society’, and that it is easier to understand traditional or pre-industrial Europe if it is compared and contrasted with other societies of this type. Thus Keith Thomas and Alan Macfarlane have illuminated English witchcraft by making comparisons with witchcraft in African tribal societies, while Frédéric Mauro and Witold Kula, among others, have compared the economies of early modern Europe with those of the developing countries today. Even Richard Cobb, no great friend to the social sciences, has recorded that he came to understand eighteenth-century Paris better after visiting contemporary Calcutta. In fact, the city is an obvious and splendidly tangible unit of comparison, and it is not surprising that the term ‘pre-industrial city’ is passing into general use.