By Rudolf Steiner
Copyright © 1940
Published by the Section for Speech and Music at the
Goetheanum, Dornach, Switzerland.
This publication was arranged by Edwin Froböse and Werner Teichert
with permission of Marie Steiner. Thanks to
Dr. Ernst Katz,
emeritus professor of physics at the University of Michigan,
this English translation is now available.
Another English version is available as,
The German version is available as,
This e.Text edition is provided through the wonderful work of:
Philosophisch-Anthroposophischer Verlag Am Goetheanum
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