French engraving representing two types of monkey (jocko and pongo) by the drawer Victor Adam dating from the middle of the 19th century.
Jean-Victor Vincent Adam, born in Paris on January 28, 1801 and died in Viroflay on December 30, 1866, is a French painter and lithographer. He has illustrated numerous works and his drawings have been interpreted in engraving by Antoine François Gelée, Émile Giroux and Jean-François Pourvoyeur.
This engraving is probably the result of a reissue of the encyclopedia on wildlife of Buffon.
The Jocko is a monkey described by the Earl of Buffon in the fourteenth volume of his Natural History published in 17661. It is presented, alongside the «Pongo», as an orangutan. His description actually corresponds to that of a chimpanzee reported to France in 1740 and died the following year in London.