Conversation so far:
Where did William Cullen receive medical training?
William Cullen began medical training as apprentice to John Paisley, a Glasgow apothecary surgeon, then spent 1729 as surgeon on a merchant vessel trading between London and the West Indies.
Where did William Cullen teach?
In Glasgow, William Cullen gave extramural lectures for the University, on physiology, botany, materia medica, and chemistry.

Question: when did he write that book?
Self-contained rewrite: When did William Cullen write his book, First Lines of the Practice of Physic?