, and from 1842 to 1874 he held the professorship of geology in the Bergakademie of Freiberg. Botany at first attracted him, and he was one of the earliest to use the microscope in determining the structure of fossil plants. Later on he gave his attention to
geology, to the study of ore-deposits, of rocks and metamorphism; and he was regarded as an excellent teacher. His Rocks classified and described: a Treatise on Lithology (translated by P. H. Lawrence, 1866) was the first comprehensive
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