It hath it original from much grief, from study and perturbation of the brain: I have read the cause of his effects in Galen: it is a kind of deafness.
There are no more uses of "Galen" in the play.
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Galen performed some advanced operations such as cataract surgery that would not be performed again for thousands of years. Unfortunately, his faith in treating so many diseases by bleeding the patient persisted until late in the 19th century.
This is the lawn of Parth Galen: a fair place in the summer days of old.