A branch of the purging nut is used to pick out the guilty

Cases heard by the Conseil Superieur of Martinique in 1755 and again in 1767 describe the same procedure. Enslaved people were lined up and touched with a branch of the medecinier, the tree also called the Barbados nut or purging nut, in one instance by a small child, and the guilty were expected to collapse in fits of convulsions and shouting. Slaveholders reporting these events told the court that everyone on the plantations held that contact with the branch would torment a poisoner. Pierre Clement de Laussat recorded the same use of medecinier branches in a diary entry in 1807. Eating the seeds causes vomiting and stomach pain, which Orfila noted in 1814, while touching the leaves and branches does nothing at all. The ritual worked through participation. It needed the whole community present, and the verdict it produced was one they had reached together.

Between 1750 and 1791 the slave owners of Saint-Domingue lived in fear. A great many of them died of poisoning, and the colonial police could make nothing of it. Selling or preparing suspicious drugs was banned, African magic was banned, and neither prohibition touched the problem. Out of the maroon camps came leaders with reputations for power who announced that the whites would be exterminated and the enslaved set free. Some of them were politicians in every practical sense, working out how independence might actually be won. Their means were the ones available: knowledge of poisonous plants, prepared potions, and charms called garde-corps, body guards, given to rebellious slaves and said to make them proof against weapons and free of any fear of white people. What frightened the planters was that the two things came together. The pharmacology worked and the political programme was serious, and the colony had no answer to either.

From the late 1750s the enslaved people of New Orleans gathered every Sunday on an open piece of ground behind the city to trade and to enjoy themselves. They were Bambara, Mandingo, Wolof, Fulbe, Fon and Yoruba, and they were joined by free people of colour and by Native Americans. The site had been used for the corn feasts of the Houma before the French came. It was known as the Place des Negres and later as Congo Square. What went on there was drumming and dancing performed in public by hundreds of people of African descent, the bamboula, the calinda, the coujaille and the pile chactas, all of them related to Vodou rites, and it was the market where the charms called gris gris were sold. The word comes from Mende, spoken by Mandingo and Bambara people. No other place in the United States let African religion be performed so openly for so long.

From the 1740s there was no priest living even in Soyo and rarely more than one anywhere in the Kongo. In 1763 the Marquis de Pombal, Portugal's anticlerical chief minister, barred Italian Capuchins from sailing out of Lisbon. Through most of the period of his power the country's only missionary was Cherubino da Savona, who spent fourteen unbroken years there, travelled almost every province, and reported baptising more than seven hundred thousand people, plausible in a place where a whole population expected infant baptism as a matter of identity. His report of 1774 rates the provinces. Soyo was still almost entirely Christian and its prince, Dom Miguel Castro da Sylva, could read and write Portuguese, though the churches were ruins whose sites were kept swept. In Mbamba the duke paid three teachers and gathered his vassals every Saturday for the catechism. In Nsundi, the oldest Christian province, the people were now almost all pagan.