Biologisch-Dynamische Präparate rühren
Walter Stappung
Rudolf Steiners propositions for stirring Bio-Dynamic Cow Horn Manure
Preparation and Horn Silica Preparation and actual practices of hand stirring:
Comparison with the help of practical observations and the terminology of
vortex theory. (H.J. Lugt 1979 / 1983)
Practical consequences, questions for further research.
With demonstrations (and practical exercises).