Anticipation of Experimental Method
Martin Plessner suggests that a translator of the Picatrix established a medieval definition of scientific experiment by changing a passage in the Hebrew translation of the Arabic original, establishing a theoretical basis for the experimental method: "the invention of an hypothesis in order to explain a certain natural process, then the arranging of conditions under which that process may intentionally be brought about in accordance with the hypothesis, and finally, the justification or refutation of the hypothesis, depending on the outcome of the experiment".
Plessner notes that it is generally agreed that awareness of "the specific nature of the experimental method–as distinct from the practical use of it–is an achievement of the 16th and 17th centuries." However, as the passage by the translator of the Hebrew version makes clear, the fundamental theoretical basis for the experimental method was here established prior to the middle of the 13th century.
The original passage in Arabic describes how a man who witnessed a treatment for a scorpion's sting (drinking a potion of frankincense that had received seal imprints) had gone on to experiment with different types of frankincense, assuming that this was the cause for the cure, but later found that the seal images were the cause, regardless of the substance upon which they were impressed. The author of the Picatrix goes on to explain how the explanation of the effectiveness of cures passed on to him by authorities was then proved to him by his own experience.
The Hebrew translator changed the passage in question to include the following:
And that was the reason which incited me . Moreover, these secrets where already made known by Nature, and the experience approved them. The man dealing with nature has nothing to do but producing a reason of what the experience has brought out.
Plessner also notes that "neither the Arabic psychology of study nor the Hebrew definition of the experiment is rendered in the Latin Picatrix. The Latin translator omits many theoretical passages throughout the work."
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