History19th centuryUnited Kingdomhigh confidence

Henry Gray and Henry Vandyke Carter began working together on their second collaborative book, which became Gray's Anatomy, in 1855.

Notes on verification

Multiple independent, authoritative sources (RCS England, LSHTM, PMC, Wikipedia, and Richardson's biography) corroborate both the 1855 start date and the fact that this was the pair's second collaboration following the 1854 spleen monograph.

Sources