The Healing Power of Sunlight

Take a cup made of dark violet glass with a 3 to 4 zoll (± 4.50 to 6 cm) diameter, about 1 zoll (1 zoll = 1.5 cm) high, and with a very smooth rim. Have a lid made for this cup to cover it hermetically (air tight). – The Healing Power of Sunlight, Chapter 2, Paragraph 1

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