Published in support of Joseph Morenas's 1820 petition against the slave trade in Senegal, Abbé Giudicelly's observations were based on his first hand experience of the colonial administration in Senegal in 1816-18. Accused of "imposture and extravagance" (5) by the authorities, in this pamphlet Giudicelly defends himself and Morenas, reiterating that French slave ships were still calling at Senegal and being captured by the British navy on their way to the Americas, as reported in the press. As an eye-witness to the slave trade, Giudicelly gives further details of events alluded to by Morenas, including names of slave traders, and testimonies of captured slaves.