Amongst other physicians of Shakespeare's century was Mr. Valentine Greatrake, who came to London from Ireland, where his supposed magical cures had been awakening a great sensation. He hired a large house in Lincoln's Inn Fields, to which vast crowds of patients of all kinds and conditions crowded daily, all clamouring to be cured. He received them in their order, says an eye-witness, with "a grave and simple countenence." For, as Shakespeare wrote, "Thus credulous fools are caught." ("Comedy of Errors," 1, 2.) Greatrake (afterwards executed for high treason) asserted that every diseased person was possessed by a devil, and that by his prayers and laying on of hands the devil could be cast out. Lord Conway sent for him to cure an incurable disease from which his wife was suffering, and even some of the most learned and eminent people of the time were amongst his patrons. St. Evremond wrote, "You can hardly imagine what a reputation he gained in a short time. Catholics and Protestants visited him from every part, all believing that power from heaven was in his hands."
In an Act of Parliament which was passed in the year 1511, we read, in its preamble, that "the science and cunning of Physic and Surgery" was exercised by "a great multitude of ignorant persons, of whom the greater part have no manner of insight in the same, nor in any other kind of learning--some also can read no letters in the book--so far forth that common artificers, as smiths, weavers, and women, boldly and accostumably took upon them great cures, and things of great difficulty, in which they partly used sorceries and witchcraft, and partly supplied such medicines unto the diseased as are very noisome, and nothing meet therefore; to the high displeasure of God," etc.
A large number of the pretended remedies thus used in medical practice are clearly traceable back to the ancient Magi, who were professors of medicine, as well as priests and astrologers.
With these facts before you, turn to your Shakespeare, and see how he regarded the popular delusions thus created and fostered, with their
"Distinguished cheaters, prating mountebanks, And many such libertines of sin." --_Comedy of Errors._
Do you remember the other lines from this source, in which the poet speaks of "This pernicious slave," who "forsooth took on him as a conjurer, and, gazing in mine eyes, feeling my pulse, and with no face, as't were, outfacing me, cried out I was possessed." This is not the stern, grave doctor in "Macbeth," who did not pretend to "raze out the written troubles of the brain," but said, "Therein the patient must minister unto himself." There is no depreciation of the healing art in Shakespeare's painting of Lear's physician, as there is of the "caitiff wretch" of an apothecary, who sold poison to Romeo in a very different way to that in which the physician in Cymbeline supplied a deadly drug to the Queen. "I beseech your grace," says he, speaking in solemn earnestness, "without offence (my conscience bids me ask) wherefore you have commanded of me these most poisonous compounds." In "All's well that Ends Well," you will recognize the foregoing descriptions of medicinal delusions in the interview between Helena and the King, who says, we "may not be so credulous of cure, when our most learned doctors leave us, and the congregated college have concluded that labouring art can never ransom Nature from her maid estate, I say we must not so stain our judgment, or corrupt our hope, to prostitute our past-cure malady to empirics." In this play both "Galen and Paracelsus" are mentioned, and their names then represented rival schools of medicine.