Introduction -- The Grand Design -- The Struggle to Complete the Imperial Plan -- The Period of Distractions -- Building in the Right Bank Centre, 1850 -- 1914 -- The Indian Summer of Central Paris -- The Battle for Preservation, 1850-1914 -- The Abandonment of the Grand Design -- The Approach of Obsolescence -- Victory for Preservation -- Conclusion -- Appendix I : Sources -- Appendix 2 : Graphs and Diagrams