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 says white vitriol was at first known as erzalaum, brass-alum, and later as gallitzenstein, a name which he thinks may have been derived from galls, as the vitriol and galls were for a long time the principal articles used for making ink and for dyeing. Green vitriol, he adds, was called green gallitzenstein. The true nature of several vitriols was not understood until 1728, when Geoffrey studied and explained them.

The ideas entertained of zinc by the chemists who studied it were curious. Albertus Magnus held that it was a compound with iron; Paracelsus leaned to the idea that it was copper in an altered form; Kunckel fancied it was congealed mercury; Schluttn thought it was tin rendered fragile by combination with some sulphur; Lemery supposed it was a form of bismuth; Stahl held that brass was a combination of copper with an earth and phlogiston; Libavius (1597) described zinc as a peculiar kind of tin. The metal he examined came from India.

The white oxide of zinc was originally known as pompholyx, which is Greek for a bubble or blister, nihil album, lana philosophica, and flores zinci. The unguentum diapompholygos, which was found in the pharmacopœias of the eighteenth century, and was a legacy from Myrepsus, was a compound of white lead and oxide of zinc in an ointment which contained also the juice of nightshade berries and frankincense. It was deemed to be a valuble application for malignant ulcers.

Oxide of zinc as an internal medicine was introduced by Gaubius, who was Professor of Medicine at Amsterdam about the middle of the eighteenth century. It had been known and used under the name of flowers of zinc from Glaubers time. A shoemaker at