Rudolf Steiner deals with topics ranging from limestone to Lucifer! He discusses, among other things, technology; the living earth; natural healing powers; colour and sickness; rainbows; whooping cough and pleurisy; seances; sleep and sleeplessness; dreams; reincarnation; life after death; the physical, ether and astral bodies and the 'I'; the two Jesus children; Ahriman and Lucifer; the death, resurrection and ascension of Christ; Dante and Copernicus.
