Contents: Essays on the Origin of Human Knowledge. Introduction. Part II: Language and Method. The Origin and Development of Language. The Origin of the Language of Action and of Articulate Sounds. Words. Methods. Method: The First Cause of Our Errors and the Origin of Truth. The Manner of Determining Ideas or Their Names. The Order to Follow in the Search for Truth. The Order to Follow in the Exposition of Truth. Course of Study for the Instruction of the Prince of Parma.