  Part 2 develops Bacon's new method for scientific investigation, the Novum Organum, equipping the intellect to pass beyond ancient arts and thus producing a radical revision of the methods of knowledge; but it also introduces a new epistemology and a new ontology. Bacon calls his new art Interpretatio Naturae, which is a logic of research going beyond ordinary logic, since his science aims at three inventions: of arts (not arguments), of principles (not of things in accordance to principles), and of designations and directions for works (not of probable reasons). The effect Bacon looks for is to command nature in action, not to overcome an opponent in argument. The Novum Organum is the only part of the Instauratio Magna which was brought near to completion.