Hugh Lofting,
The Story of Doctor Dolittle
(1920)
“ So Gub-Gub went and woke the Doctor who was taking a nap. "Listen," whispered the parrot, when John Dolittle's face appeared: "Prince Bumpo is coming here to-night to see you. And you've got to find some way to turn him white. But be sure to make him promise you first that he will open the prison-door and find a ship for you to cross the sea in." "This is all very well," said the Doctor. "But it isn't so easy to turn a black man white. You speak as though he were a dress to be redyed. It's not so simple. 'Shall the leopard change his spots, or the Ethiopian his skin,' you know?" ”
