  Although Aristotle provided specific axioms for every scientific discipline, what Bacon found lacking in the Greek philosopher's work was a master principle or general theory of science, which could be applied to all branches of natural history and philosophy (Klein 2003a). For Bacon, Aristotle's cosmology, as well as his theory of science, had become obsolete and consequently so too had many of the medieval thinkers who followed his lead. He does not repudiate Aristotle completely, but he opposes the humanistic interpretation of him, with its emphasis on syllogism and dialectics (scientia operativa versus textual hermeneutics) and the metaphysical treatment of natural philosophy in favor of natural forms (or nature's effects as structured modes of action, not artifacts), the stages of which correspond—in the shape of a pyramid of knowledge—to the structural order of nature itself.