Gases are dried by leading them through towers or tubes containing an appropriate drying material.
Of the numerous churches in the city the most interesting are the Stiftskirche, with two towers, a fine specimen of 15th-century Gothic; the Leonhardskirche, also a Gothic building of the 15th century; the Hospitalkirche, restored in 1841, the cloisters of which contain the tomb of Johann Reuchlin; the fine modern Gothic church of St John; the new Roman Catholic church of St Nicholas; the Friedenskirche; and the English church.
The façade, flanked by two towers with cupolas, is decorated with arcades filled in with statuary and sculpture, the whole representing the Last Judgment.
The hotel de ville, also by Abadie, is a handsome modern structure, but preserves two towers of the château of the counts of Angouleme, on the site of which it is built.
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