Ron Brunton revives a problem posed by the great anthropologist W. H. R. Rivers in History of Melanesian Society (1914): how to explain the strange geographical distribution of kava, a narcotic drink once widely consumed by south-west Pacific islanders. Rivers believed that it was abandoned by many people even before European contact in favour of another drug, betel, drawing his speculations from the ideas of the diffusionist school of anthropology. However, Dr Brunton disagrees. Taking the varying fortunes of kava on the island of Tanna, Vanauta, as his starting point, he suggests that...