In his satirical poem, English Bards and Scotch Reviewers (1809), Lord Byron mocked medical charlatans who repeatedly introduced new gimmicks in order to extort large sums of money from gullible customers:
What varied wonders tempt us as they pass!
The Cow-pox, Tractors, Galvanism, Gas,
In turns appear to make the vulgar stare,
Till the swoll’n bubble bursts – and all is air.