A physician and his female patient talking at cross purposes. Wood engraving by C. Keene, 1880.

Caption reads: 'Old Lady (to eminent physician) "Tell me, doctor, what do you consider the most important rule of all for health?" Doctor (whose ideas run much on the hygenic properties of soils and air & c) "My dear madam - always live on gravel." Old Lady (whose thoughts take a more gastronomic turn) "Oh doctor! I'm sure I couldn't digest it!!"'