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

  2. Glass plates with spectrum image. Several of the spectra plates are labeled with wavelengths on the front and back.

  3. Portrait of Ezekiel [Ezéchiel] Weintraub, a Russian-born chemist who was the first to produce 99 percent pure boron in 1909.

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

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

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

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

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

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

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

  11. A mid-length portrait of Robert Hare, MD.