A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c21.37
A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c21.37
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v1.c21.37
² The heating for 3 or 4 days together as recommended in the Hindu method need not be taken seriously, indeed it must be regarded as an extravaganza of the old alchemists. Professor Divers in applying his theory of ærial oxidation to the Chinese process has been led to suppose that it "takes 4 or 5 hours' firing, since this may give time enough for the needed oxygen to diffuse through the cup and luting."