Cosmic Memory: Prehistory of Earth and Man by Rudolf Steiner. A basic book of anthroposophy. (CW 11)
For your convenience, below is a zip file of this entire set of lectures. It does require that you have an unzipping utility of some kind on your computer. For you mac people this is built in.
The Entire Book Cosmic Memory: Prehistory of Earth and Man
1. Contemporary Civilization in the Mirror of the Science of the Spirit (1904)
4. Transition of the Fourth into the Fifth Root Race
7. The Last Periods before the Division into Sexes
8. The Hyperborean and the Polarean Epoch
9. Beginning of the Present Earth, Extrusion of the Sun
11. Some Necessary Points of View