History of the origin of medicine, delivered at the anniversary meeting of the Medical Society of London, January 19, 1778, and printed at their request. To which are since added, various historical illustrations.

The work covers the "origin of medicine" from the time of the Creation to the Trojan War (6000 – 1184 BCE), and describes both Old and New World medical practices of the period. The lectures were necessarily relatively general, but the footnotes, which occupy more than half of the text, provide full details ("historical illustrations") and identify all of Lettsom's printed sources. Digital facsimile from wellcomecollection.org at this link.