jan 16, 681 - Geber analyzed each Aristotelian element in terms of four basic qualities of hotness, coldness, dryness, and moistness. He theorized that every metal was a combination of these four principles, two of them interior and two exterior. He reasoned that the transmutation of one metal into another could be affected by the rearrangement of its basic qualities.
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Date:
jan 16, 681
Now
~ 1345 years ago