RICHARD CLAY AND SONS, LIMITED, BREAD STREET HILL, E.C., AND BUNGAY, SUFFOLK. The acknowledgment at the foot of page 308, of the source of the symbols illustrated on that page, is incorrect. The symbols in question are reproduced from Mr. C. J. S. Thompson’s book, _The Mystery and Romance of Alchemy and Pharmacy_, published by the Scientific Press, Ltd.…
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