Image of farting man from 1770 childrens book

Fart humor has always been appealing to humans, even in 1770. This children's book of riddles contained this image of a jolly fellow cutting the cheese.

Why the man is tooting onto a candle stick, I'll never know. I wonder what the riddle for this image was?

I love imagining kids in the 1770's cracking up at this image. 

"Illustration from The Child's New Year's Gift (A collection of riddles), 1770 London. #fart#artsyfartsy"