The object of the present Analysis is to place in the hands of students a detailed and exhaustive scheme of every Prelude and Fugue. In the Preludes the mode of procedure has been: 1) To give the Figure upon which each Prelude is built, 2) To give the Prelude itself in full and copiously marked, or in a reduced form showing the structure, 3) a 'Summary' of the piece, and lastly, general 'remarks' upon the structure and treatment of the materials. For the Fugues a Tabulated Analysis-bar by bar- is first given, then a 'summary' and 'remarks' as before.