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By H. Stanley Redgrove

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The alembic proper is a sort of stillhead which can be luted on to a flask or other vessel, and was much used for distillations. In the present case, however, the alembics are employed in conjunction with apparatus for subliming difficultly volatile substances. Plate 5, fig. B, shows another apparatus for sublimation, consisting of a sort of oven, and three detachable upper chambers, generally called aludels. In both forms of apparatus the vapours are cooled in the upper part of the vessel, and the substance is deposited in the solid form, being thereby purified from less volatile impurities.

In all this, compared with many other alchemists, Bonus, though somewhat prolix, is remarkably lucid. All metals, he argues, following the views of pseudo-Geber, consist of mercury and sulphur; but whilst the mercury is always one and the same, different metals contain different sulphurs. There are also two different kinds of sulphurs -- inward and outward. Sulphur is necessary for the development of the mercury, but for the final product, gold, to come forth, it is necessary that the outward and impure sulphur be purged off.

Sir H. E. , and C. S: A Treatise on Chemistry, vol. i. (1905), p. 9. 17. One hundred and Fourteen Experiments and Cures of the Famous Physitian Theophrastus Paracelsus, whereunto is added. certain Secrets of Isaac Hollandus, concerning the Vegetall and Animall Work (1652), p. 35. 18. BERNARD, EARL OF TRÉVISAN: A Treatise of the Philosophers Stone, 1683 (see Collectanea Chymica: A Collection of Ten Several Treatises in Chemistry, 1684, P. 91). 19. Sir GEORGE RIPLEY: The Compound of Alchemy (see Theatrum Chemicum Britannicum, edited by Elias Ashrnole, 1652, p.

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