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Quotation from A System of Logic, Book III: Of Induction by John Stuart Mill
“there are some truths in medicine which are sufficiently proved by direct experiment.”
A System of Logic, Book III: Of Induction, Book III, Ch. X, § 8 (8th ed. (New York: Harper, 1882); Project Gutenberg text)

After showing how hard it is to prove a remedy by experiment, Mill names the specifics, such as quinine and lime-juice, whose effect is strong enough to be proved directly.
Citation: "there are some truths in medicine which are sufficiently proved by direct experiment." — John Stuart Mill, A System of Logic, Book III: Of Induction, Book III, Ch. X, § 8 (8th ed. (New York: Harper, 1882); Project Gutenberg text). (id mill-system-of-logic-book-iii-q7)
Portrait: John Stuart Mill by London Stereoscopic Company, c1870, London Stereoscopic Company, Public domain.
