The watercolour shows a rural medical practitioner, a woman, not young, using her own urine to create a medicine which she offers for sale for rubbing on the eyes to dispel bad humours of the eye. She urinates in the right foreground into a funnel over a chemical vessel, while another, younger woman urinates in the left background into a funnel placed in a barrel, and a cat urinates in the left foreground on to the ground. ‘Humours in the eyes’ which are mentioned on the signboard seem to have been a kind of disease, possibly cataract.