Among the books he illustrated is Alice In Wonderland.
Here is the page titled "It's a Cheshire-Cat."
" 'How do you know I'm mad?' said Alice.
"' You must be,' said the Cat, `or you wouldn't have come here.' "
" 'All right,' said the Cat; and this time it vanished quite slowly, beginning with the end of the tail, and ending with the grin, which remained some time after the rest of it had gone."
All these are pictures from Alice's Adventures in Wonderland by Lewis Carroll, illustrated by Willy Pogany. New York: E.P. Dutton and Co., 1929.