Note 1597 — BOOK XXXIV. THE NATURAL HISTORY OF METALS.
John Bostock translation
Most of these preparations are in reality highly dangerous. Oxides, however, or salts of copper, have been employed internally with success, acting by alvine evacuation and by vomiting. The Crocus Veneris of the old chemists was an oxide of copper. It is still used by the peasants of Silesia, Ajasson says.