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ROUELLE, GUILLAUME FRANCOIS (1703–1770)

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Originally appearing in Volume V23, Page 768 of the 1911 Encyclopedia Britannica.
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ROUELLE, See also:GUILLAUME See also:FRANCOIS (1703–1770) , See also:French chemist, was See also:born in 1703 at Mathieu, near See also:Caen. He started as an See also:apothecary, but in 1942 he was appointed experimental demonstrator of See also:chemistry at the Jardin du Roi in See also:Paris, where he was especially influential and popular as a teacher, numbering See also:Lavoisier and J. L. See also:Proust among his pupils. Many stories are told of the vivacity and See also:enthusiasm with which he lectured, of the absent-mindedness which sometimes led him, forgetting that his pupils could not hear what he was saying, to continue his explanations while he was out of the classroom looking for some piece of apparatus, and of the vigorous tirades, generally culminating in the epithet " plagiaire," in which he used to indulge against men with whom he disagreed (See also:Hofer, Hist. de la chimie, ii. 378). His most important achievement was to define " salts "—a See also:term formerly used in the most loose and indeterminate way—as the compounds formed by the See also:union of acids and bases, and further to distinguish between neutral, basic and See also:acid salts. Other subjects on which he published papers were the inflammation of See also:turpentine and other essential See also:oils by nitric acid, and the methods of embalmment practised by the Egyptians. He died at Passy on the 3rd of See also:August 1770. He is known as Rouelle the See also:elder, to distinguish him from his younger See also:brother and assistant, HILAIRE MARIN (1718–1779), who, on his resignation In 1768, succeeded him as demonstrator at the Jardin du Roi.

End of Article: ROUELLE, GUILLAUME FRANCOIS (1703–1770)

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