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- Nature answers only when she is questioned.
- Quoted in The Conquest of Epidemic Disease, Charles-Edward Amory Winslow, 1941.
- The day of the last hypothesis would be also the day of the last observation... An hypothesis displaced by new facts dies an honorable death. If it has itself summoned to its trial the facts by which it is annihilated, it deserves even a monument of gratitude.
- Handbook of Rational Pathology, 1846-1853