| E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898. |
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Powder of projection, or the “Philosopher’s Stone.” A powder supposed to have the virtue of changing baser metals into gold or silver. A little of this powder, being cast into molten metal of the baser sort, was to project from it pure gold or silver. Education may be called the true “powder of projection.” | 1 |
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