Chapter XIX. Hyper Space.

Authorities .... Two subjects of speculation Space of Two Dimensions Space of One Dimension . Space of Four Dimensions
Existence in such a world
Arguments in favour of the existence of such a world
Use of, to explain physical phenomena Non-Euclidean Geometries ......
Euclid's Axioms and Postulates. The Parallel Postulate Hyperbolic and Elliptic Geometries of Two Dimensions Non-Euclidean Geometries of Three or more Dimensions Non-Archimcdian Geometries of Two Dimensions .
Non-Legendrian Geometry
Semi-Euclidean Geometry ..... Truth of Axioms
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