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Alchemy: "A three-headed monster in an alchemical flask, representing the composition of the alchemical philosopher's stone: Salt, Sulphur, and Mercury." Watercolor painting from Salomon Trismosin's "Splendor solis." An Alchemy artwork.
Boethius, De musica, f.43v, (211 x 144 mm), 12th century -This is a manuscript about the theory of music. It was copied probably in England at Christ Church, Canterbury, in the second quarter of the twelfth century. Its main focus is the mathematical basis of music - Alexander Turnbull Library, MSR-05., via Flickr.