2727.1 Dorothea Juliana WALCHIN. Das mineralische Gluten, doppelter Schlangen-Stab, Mercurius Philosophorum, langer und kurtzer Weg zur Universal-Tinctur. Deutlich und klärlich entdecket und angewiesen durch D.I.W. von Weimar aus Thüringen. 8° Leipzig: in Verlegung Joh. Heinichens Wittwe 1705 Ferguson Young British Library Wisconsin [Illustration:- p9 Woodcut. 100x100mm. "Figura cabalistica". Three concentric circles with 'Magnesia' and 'Vitriol' inscribed on them. Inside this is a square with "Confusum Chaos", within which is a circle with the triangle of the three principles within it. At the centre of this triangle is a circle with an ouroboros snake and a Solomon's seal.]