Matt Lutz opens at Persuasion with a great anecdote that I never heard before.
In “The Imaginary Invalid,” a play written by the French satirist Molière, a doctor is asked why opium makes people fall asleep. The doctor replies that “there is a dormitive virtue in it, whose nature it is to make the senses drowsy.” In other words, opium makes people fall asleep because it has the power to make people fall asleep. That joke has since become a favorite among philosophers and historians of science because it is a wonderful example of an explanation that doesn’t explain. Rather than provide an understanding of why opium causes sleepiness, it’s a tautology dressed up in jargon.
