A rectangular headpiece is composed of multiple rows of typographical ornaments, including fleurons, stars, and scroll-like floral patterns.

WARNING

DEAR READER, several persons having shown me much eagerness to recover three Treatises of Natural Philosophy, which were printed a long time ago, but of which scarcely any copy could be found at present: I have believed that by having them reprinted, not only would you be grateful for my enterprise, but also that I could not better satisfy their desire, and the curiosity of those who apply themselves to the secret science of metals, and who make it their principal study to know their various changes, and the