Boyle at the age of 37, with his air pump in the background. Courtesy Edgar Fahs Smith Collection, Kislak Center for Special Collections, Rare Books and Manuscripts, University of Pennsylvania.

Boyle at the age of 37, with his air pump in the background. François Diodati reengraved this image from an engraving by William Fairthorne, Opera varia (1680).

Courtesy Edgar Fahs Smith Collection, Kislak Center for Special Collections, Rare Books and Manuscripts, University of Pennsylvania.