The publication in 1839 of Murchison's Silurian System incited Barrande to carry on systematic researches on the equivalent strata in Bohemia. For ten years (1840—1850) be made a detailed study of these rocks, engaging workmen specially to collect fossils, and in this way he obtained upwards of 3500 species of graptolites[?], brachiopoda, mollusca, crustacea (particularly trilobites) and fishes. The first volume of his great work, Système silurien du centre de la Bohtme (dealing with trilobites), appeared in 1852; and from that date until 1881, he issued twenty-one quarto volumes of text and plates. Two other volumes were issued after his death In 1887 and 1894. It is estimated that he spent nearly £10,000 on these works. In addition he published a large number of separate papers. In recognition of his important researches the Geological Society of London[?] in 1855 awarded to him the Wollaston medal[?].
Barrande died at Frohsdorf[?] on the 5th of October 1883.
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