Translations:Manfred Klett: Von der Agrartechnologie zur Landbaukunst/1381/en

Only when one turns to the outward appearance of the pedunculate oak — to its particular substance-processes, its relationship to the world of insects and the peripheral forces — does one begin to approach an understanding of the spiritual researcher's statement: that "what is present as calcium structure in the oak bark is the most ideal thing possible" for producing, by way of a further-working preparation, a manure capable of "combating plant diseases prophylactically."