This book is divided into "an examination of the several ways of communicating our thoughts by speech" and "an attention to the principles of those literary compositions which contribute to persuasion or entertainment".The species of communication discussed include descriptive and narrative (or historical) composition, poetry, demonstrative oratory, panegyric, didactic or scientific language, deliberative oratory, and judicial or forensic oratory.The subjects addressed in his teachings include the style and genius of some of the best of the ancient writers and poets, especially the historians and the English classics.