The Haitian abolitionist Linstant, present at the World Anti-Slavery Convention in London in 1840, also won the prize of the French Society for the Abolition of Slavery the same year for his essay: 'The means of uprooting colour prejudice against Africans and mixed race peoples'. It stresses the centrality of racial prejudice to the problem of colonial slavery, and argues that ending both slavery and racism would be of enormous cultural benefit not only to Africa and the Americas, but also to Europe. Linstant calls for recognition of the contribution of the Republic of Haiti in combatting slavery and prejudice. In his overview of slavery as a global issue, he examines the case of the French, British Spanish, Dutch and Danish colonies along with North and South America, and cites Clarkson, de Tocqueville, Lacharrière and Barclay, among other pro- and anti-slavery writers.