A medicine vendor kneeling and praying. Doctor Rock (Richard Rock 1690-1777) was an itinerant medicine vendor who frequented the London areas of St. Pauls and Covent Garden. He was famous for his "anti-venereal, grand, specifick pill". He was satirised in several caricatures: W. Hogarth represented him in A harlot's progress pl. V; The march to Finchley; and The four times of the day, morning.
"A fashionably-dressed man kneels in profile to the left at a large chest of 'Patent Medecines', on which is a duck with the inscription 'Quack. Quack. Quack' [cf. British Museum Satires No. 5766]. A hanging candelabra and a festooned curtain indicate wealth. He prays to the shade of Dr. Rock, describes the composition of his famous Vegetable Drops, and asks for the continuance of 'my Carriages and Equipage, my Town and Country Residence, and all other good things of this life ...'."--British Museum online catalogue.