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Claude-Louis Berthollet (1748-1822), French chemist. Berthollet was an early supporter of Lavoisier, but correctly disagreed with him by proposing that some acids do not contain oxygen. His book Essai de statique chimique (1803) was the first systematic work on chemical physics. Berthollet was made a count (Comte Berthollet) by Napoleon Bonaparte. Engraving from Les Savants Modernes (1899).
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