An engraving of Swiss physician and alchemist Paracelsus (born Theophrastus von Hohenheim) wearing a small medal around his neck.

A half-length seated portrait of Joseph Priestley (1733–1804), an English clergyman and natural philosopher who discovered oxygen.

This etching, after a print by Balthasar Moncornet, in turn after a drawing by Rembrandt, claims to display a portrait of the French manuscript seller Nicolas Flamel (1330-1418). Flamel, along with his wife Perenelle,…

This print, after a painting by Adriaen van Ostade, shows a humble peasant-alchemist at work before a furnace. Working with a pair of hand bellows—the source of the alchemists' mocking nickname, "puffer,"— the alchemist…

A half-length portrait of French scientist Joseph Louis Gay-Lussac (1778–1850).

Mezzotint of a portrait bust of the Irish chemist Robert Boyle (1627–1691) in an arched niche.

A half-length seated portrait of Martin Folkes (1690–1754), English mathematician and president of the Royal Society.

A half-length seated portrait of the 17th-century doctor Gerardus Blasius pointing to an anatomy figure in a book.

A framed portrait of Joseph Black (1728–1799), professor of chemistry at University of Glasgow, seated and holding a document.

A three-quarter-length portrait of Thomas Graham (1805–1869), the Scottish chemist who worked on the diffusion of gases.

A Chine-collé portrait of English naturalist Charles Darwin (1809–1882) sitting in a wicker chair near a hanging tapestry.

A mid-length portrait of Robert Hare, MD.