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... his investigation of certain organic compounds of arsenic, in the process of which he discovered that ferric oxide could be used as an antidote to arsenic poisoning. From his studies of the gaseous products of blast furnaces he evolved a method of gas analysis, presented in his book Gasometrische Methoden (1857). With Kirchhoff at Heidelberg he discovered by spectroscopy the elements cesium and rubidium. His important contributions to petrology and chemicogeology include the explanation of geyser action. He invented and improved various kinds of laboratory equipment.
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