The Ethers express due to them being influenced by the Astrality
Below is an extract of the second lecture of the second medical course given on April 12 1921
It is available in full at
In this lecture Dr Steiner talks of the way the ethers work into the human body, and then goes on to describe how the energetic bodies work together. He then discusses Sulphur, Phosphorus and Arsenic as influences of these processes.