from "When Dalliance was in Flower and Maidens Lost Their Head" [The Tunbridge Doctors, or, Four Able Physicians]

"From fair London town, there have lately come down,
"Four able physicians who never saw gown"
"Their physic is useful, their dosage is large
"And you may be cured without trouble or charge"

more to follow, gotta go double-check to be sure I remember all the verses...