Six discourses

Contents: The life of Sir John Pringle, Bart -- A discourse on the different kinds of air -- A discourse on the torpedo -- A discourse on the attraction of mountains -- A discourse upon some late improvements of the means for preserving the health of mariners -- A discourse on the invention and improvements of the reflecting telescope -- A discourse on the theory of gunnery

With a final leaf of erratum. Advertisement: sign. A4v. Each discourse originally published separately, 1773-1778 ; each has separate divisional titles.