Guenther Wachsmuth on Rudolph Steiner’s concept of the ether.
Artists, scientists, philosophers, and engineers alike will benefit from this in depth treatise on qualitative science. Ranging far beyond just light and color, this book covers a complete set of both aesthetic and scientific principles of nature. Art and science are wonderfully woven together into a fascinating book.
Walter and Lao Russell’s 1950 edition of the Home Study Course of Universal Law, Natural Science and Philosophy. An intimate guide to the cosmogony of a man who understood the inner workings of the universe on a very personal level, as you will read about. This course takes from several months to a year or more to complete, and it is intended that you progress at your own speed, taking however much time is required to absorb the information presented here.