Claude Nicolas Ledoux embraced the principle of superimposing the classic column motifs on each floor, rising from simplest to the most complex: Tuscan, Doric, Ionic, Corinthian, etc. On 26 July 1764, in the Saint-Eustache Church, Paris, Ledoux married Marie Bureau, the daughter of a court musician. A friend from Champagne, Joseph Marin Masson de Courcelles, found him a position as the architect for the Water and Forestry Department. Here between 1764 and 1770 he worked on the renovation and designs of churches, bridges, wells, fountains and schools, in Tonnerrois, Sénonais and Bassigny. Among the still extant works from this period are the bridge
Ionic compound usually in a crystalline structure. Ionic compounds containing hydrogen ions (H) are classified as acids, and those containing basic ions hydroxide (OH) or oxide (O) are classified as bases. Ionic compounds without these ions are also known as salts and can be formed by acid–base reactions. Ionic compounds can also be produced from their constituent ions by evaporation of their solvent, precipitation, freezing, a solid-state reaction, or the electron transfer reaction of reactive metals with reactive non-metals, such as halogen gases. Ionic compounds typically have high melting and boiling points, and are hard and brittle. As solids they are almost