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Up to this time metallic calces, and for the most part alkalis and earths also, had been regarded as elementary substances.

Oils dissolve the calces of lead, which, by this means, is the basis of paints, plaisters, &c.

Absorption is increased by the calces or solutions of mercury, lead, zinc, copper, iron, externally applied; and by arsenic, and by sulphur, and by the application of bitter vegetables in fine powder.

The third refers to the great quantity of pure air contained in the calces of metals.

Now they triumphantly asked, Why, when metals dissolve in diluted vitriolic or muriatic acid with evolution of inflammable air, are calces of these metals produced?