The Influence of Spiritual Beings upon Man by Rudolf Steiner. A Collection of 11 lectures given in Berlin (CW 102) between January 6 and June 11, 1908.
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 The Influence of Spiritual Beings upon Man
Lectures concern (no titles):
1. Beings of the Astral Plan and Devachan
2. Planets and Zodiac, Time and Duration.
3. Origin of our solar system from the standpoints of natural science and spiritual science.
4. The Warmth element on Ancient Saturn
5. World evolution through Saturn, Sun, Moon, and Earth.
6. The Time Reversal in the recapitulation of evolutionary conditions.
7. The spiritual hierarchies above man
8. Elemental Beings
9. Birth and Death in animal and man.
10. Phantoms, Spectres, and Demons.
11. Man's union with Spiritual Beings through art.