43 of the letters are addressed to Charles Mancel de Vegobre.

The journal details Morgan’s tour from Rome to London in 1764 and provides details of the imporant persons he met during this time, including Voltaire. He also writes about universities and academies, palaces, cities, travel, and social life in eighteenth-century Europe. The copy of the 1764 journal is accompanied by his daybook of 1781-1788 which contains accounts of his professional activities such as the medical supplies he sold to his patients and the services he rendered.

Josiah Martin opens the letter with a discussion of Thomas Godfrey. He then turns to a letter written to Voltaire on the subject of books and the military.