- § 374. Distinction between projective and descriptive geometry
- § 375. Method of Pasch and Peano
- § 376. Method employing serial relations
- § 377. Mutual independence of axioms
- § 378. Logical definition of the class of descriptive spaces
- § 379. Parts of straight lines
- § 380. Definition of the plane
- § 381. Solid geometry
- § 382. Descriptive geometry applies to Euclidean and hyperbolic, but not elliptic space
- § 383. Ideal elements
- § 384. Ideal points
- § 385. Ideal lines
- § 386. Ideal planes
- § 387. The removal of a suitable selection of points renders a projective space descriptive

The Principles of Mathematics was written by Bertrand Russell, and published in in 1903. It is now available in the Public Domain.