This is a portrait of James Wilkinson also known as "Daft Jamie." Wilkinson was a victim of Burke and Hare. He was "burked" in Hare's boarding house, and then Burke and Hare sold Wilkinson's body to Dr. Knox for his dissections.
According to the Wellcome Collection, "The Oxford English dictionary defines 'pitch-plaster' as 'A dressing containing pitch, used as a depilatory. Also: a dressing containing Burgundy pitch, used in the treatment of chest and rheumatic disorders'…
This painting is also known as "Burkeing the constitution of England!!!!!". According to the Wellcome Collection, "John Bull lies on a bed, resting his head on a tick-covered bolster. The Duke of Wellington tries with his left hand to asphyxiate him…