[2] In Sicily Slade visited Ignazio Paternò Castello with a letter of introduction from Sir William Hamilton.
[1] In Venice he made significant art purchases from the estate of the collector Bartolomeo Vitturi (1719–1776), with John Udny.
[5] Slade spent three years in Venice, and while there commissioned the 1775 Francesco Guardi Bird’s Eye View painting of the city.
[7] In the period after the French Revolution, Slade bought the paintings by Flemish, Dutch and German artists from the Orleans Collection, in 1792.
[11] Slade was a dealer based in Bond Street in 1801, and a sales catalogue shows he stocked paintings by the English artists Joshua Reynolds, John Rathbone and James Thornhill, as well as many foreign masters.