Translations:Manfred Klett: Von der Agrartechnologie zur Landbaukunst/1368/en

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Referring to the particularly ideal calcium structure,[1] Rudolf Steiner speaks of oak bark; the distinction made in botany between this and the outer bark goes unmentioned. This has led to differing views on which of the two — the mirror bark or the outer bark — is to be used for the preparation. Hoerner, in his thorough and comprehensive account, argues decisively for the mirror bark of the young tree: the bark that was once used as oak tanbark for curing hides.[2]

  1. Rudolf Steiner: Ebd., S. 134: «In Bezug auf dasjenige, was dann als Kalzium zutage tritt, ist dasjenige, was an Kalziumstruktur in der Eichenrinde vorhanden ist, das alleridealste.»
  2. Erdmut-M. W. Hoerner: Die biologisch-dynamischen Präparate, Stuttgart 2019, 512 S.