Chapter III. The form, name, dimensions, invention, material,

and use of obelisks. 18-25

§1. The form of the obelisk and the pyramidion. 18-21.

§2. The derivation of the name "obelisk". 21-22.

§3. The dimensions of obelisks. 22-23.

§4. The material of obelisks. 23-24.

§5. The invention of obelisks and the use they were put to.

24-25.