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, fighting took place in and around the observatory.<unk>, fighting took place in and around the observatory. Quetelet conservé sa position sous le nouveau gouvernement et commença des observations scientifiques. By 1834, buildings and instruments were finally completed. Adolpe Quetelet was succeeded by his son Ernest upon his death in 1874.<unk> Adolpe Quetelet was succeeded by his son Ernest upon his death in 1874.