GIA4789032 A column of slaves crossing a mortuary drill: a white man with a whip commands his slaves. Illustration of the 19th century for Paul Belloni Du Chaillu\'s book ???dventures au pays des gorillas?? Engraving from 1867. by French School, (19th century); Private Collection; (add.info.: A column of slaves crossing a mortuary drill: a white man with a whip commands his slaves. Illustration of the 19th century for Paul Belloni Du Chaillu\'s book ???dventures au pays des gorillas?? Engraving from 1867.); by Giancarlo Costa; French, out of copyright.