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 oxidized to carbon dioxide and water, the former being absorbed by caustic potash, and the latter by calcium chloride. The method now in use differs from that of Liebig in only a few particulars, the principal of which is that gas has superseded charcoal.

In 1824 Liebig returned to Germany, having been appointed Professor of Chemistry in the University of Giessen—a seat of learning which he made famous throughout the world by means of his discoveries and teaching, and where he attracted students from all parts of Europe.

About this time Liebig gave special study to the cyanates, which were also being studied by Wöhler. The two young men became friends, recognized each others powers, and aided each other in scientific work, and many papers were published under their joint names. Liebig's researches were published in Poggendorff's Annalen; Liebig's Annalen der Chemie und Pharmacie; Handwörterbuch der reinen und angewandten Chemie; and Jahresbericht der Chemie: in all he published three hundred papers.

Liebig remained at Giessen for twenty-eight years, i.e., until 1852, when he accepted the chair of chemistry in the University of Munich. This was due to the influence of the King of Bavaria. His fame spread rapidly, and students filled his laboratory. Great enthusiasm was evinced at his lectures, and though not a fluent lecturer, the knowledge he imparted carried away his audience,