“Indeed, proof that a given condition always precedes or accompanies a phenomenon does not warrant concluding with certainty that a given condition is the immediate cause of that phenomenon. It must still be established that when this condition is removed, the phenomen will no longer appear.”

—  Claude Bernard

Introduction à l'Étude de la Médecine Expérimentale (1865)

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Claude Bernard 21
French physiologist 1813–1878

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