4th Dimension Simply Explained | Henry P Manning

IntroductionI. An Elucidation of the Fourth DimensionII. Non-Euclidean Geometry and the Fourth DimensionIII. Fourth Dimension AbsurditiesIV. The Boundary of the Four-Dimensional Unit and Other Features of Four-Dimensional SpaceV. How the Fourth Dimension May Be StudiedVI. Space and HyperspaceVII. An Interpretation of the Fourth DimensionVIII. Length, Breadth, Thickness, and Then What?IX. The Fourth Dimension Algebraically ConsideredX. Difficulties in Imagining the Fourth DimensionXI. Some Fourth Dimension CuriositiesXII. Characteristics of the Fourth DimensionXIII. The Fourth Dimension, the Playground of MathematicsXIV. The True and the False in the Theory of Four DimensionsXV. The Ascending Series of DimensionsXVI. The Mind's Eye and the Fourth DimensionXVII. Other Dimensions Than OursXVIII. The Meaning of the Term "Fourth Dimension"XIX. A Pupil in Geometry Quizzes His Teacher About the Fourth DimensionXX. Possible Measurements and Forms in a System of Four DimensionsXXI. The Fairyland of the Fourth DimensionXXII. The Properties of Four-Dimensional Space