There is such a thing as a philosophers stone, though (well, mythologically), and there is no such thing as a sorcorers stone. It's like saying, "They're never heard of unicorns, so we'll call them horn-horses."
The philosophers' stone was an alchemical concept - it was supposed to be able to turn lead into gold.
I as a reader am very insulted. That's why I buy the Canadian editions.
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Alpha Xi Delta
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