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Extra resources for A textbook of inorganic chemistry vol.XI part I Organometalic compounds. Derivatives of the elements of groups I to IV
L. Bianchi justification for the practice of alchemy. This is shown by the fact that, in his authenticated works, alchemical techniques are acknowledged only in their application to pharmacology and are judged as totally useless for the transformation of metals. In Bucher Archidoxis, for example, after having stated that he has no skill in the preparation of the lapis philosophorum, Paracelsus adds that the compound to which he has given this name is so called simply because it has the same effect on the human body which the alchemists claim for "their" lapis on the bodies of metals.
66 It is easy to see how in this concept of knowledge being mediated by signs we find a further expression of the Paracelsian epistemological ideal of a mutual conversion of the visible and the invisible. Whereas in the procedures described in Opus paramirum this is realized thanks to the separation of substances by fire, it is now realized indirectly, on an exclusively mental plane. In reading the signs that are always encountered on the surface of things, that which is immediately perceived, the material and visible vehicle of the sign, is a datum that must be transcended and rendered invisible, if the immaterial content that lies beneath it, and corresponds to it, is to appear.
17-22; Paracelsus. Introduction to Philosophical Medicine in the Era of Renaissance (Basle-New York, 1982), pp. 258-78, particular reference has been made to the following: E. Darmstaedter, "Arznei und Alchemie. Paracelsus-Studien", Studien zur Geschichte der Medizin, 20 (1931), pp. 1-77; W. Ganzenmiiller, "Paracelsus und die Alchemie des Mittelalters", Beitriige zur Geschichte der Technologie und Alchemie (Weinheim, 1956), pp. P. Multhauf, "Medical Chemistry and 'The Paracelsians''', Bulletin of the History of Medicine, 30 (1956), pp.