1Introduction
8Four-Dimensional Vistas (pt. 2)
2Flatland (pt. 1)
9Marks' first lessons in geometry (pt. 1)
3Flatland (pt. 2)
10Marks' first lessons in geometry (pt. 2)
4A New Era of Thought (pt. 1)
11An essay on the foundations of geometry (pt. 1)
5A New Era of Thought (pt. 2)
12An essay on the foundations of geometry (pt. 2)