COMPLETE TITLE: An Essay upon Pronunciation and Gesture: founded upon the Best Rules and Authorities of the Ancients, Ecclesiastical and Civil, and adorned with the Finest Rules of Elocution. 
Online text: INTERNET ARCHIVE

The text is a re-edition of The Art of Speaking in Publick (1727) (see), which was the second edition with a new title of the translation of the treatise by Le Faucheur Traité de l'action de l'orateur, ou de la pronunciation et du geste (see).