“Between the one who counts the facts, grouped according to their resemblance, in order to know what to believe regarding the value of therapeutic agents and him who does not count but always says "more or less frequent," there is the difference between truth and error, between something that is clear and truly scientific and something that is vague and without value—for what place is there in Science for that which is vague?”

—  Pierre Charles Alexandre Louis

Recherches sur les effets de la saignée dans quelques maladies inflammatoires, et sur l'action de l'émétique et des vésicatoires dans la pneumonie (1835) as quoted by William Coleman, Death is a Social Disease: Public Health and Political Economy in Early Industrial France (1982)

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Pierre Charles Alexandre Louis 6
French physician 1787–1872

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